What follows is an opinion from the Supreme Court of the United States. Your task is to determine the bases on which the Supreme Court rested its decision with regard to the legal provision that the Court considered in the case. Consider "judicial review (national level)" if the majority determined the constitutionality of some action taken by some unit or official of the federal government, including an interstate compact. Consider "judicial review (state level)" if the majority determined the constitutionality of some action taken by some unit or official of a state or local government. Consider "statutory construction" for cases where the majority interpret a federal statute, treaty, or court rule; if the Court interprets a federal statute governing the powers or jurisdiction of a federal court; if the Court construes a state law as incompatible with a federal law; or if an administrative official interprets a federal statute. Do not consider "statutory construction" where an administrative agency or official acts "pursuant to" a statute, unless the Court interprets the statute to determine if administrative action is proper. Consider "interpretation of administrative regulation or rule, or executive order" if the majority treats federal administrative action in arriving at its decision.Consider "diversity jurisdiction" if the majority said in approximately so many words that under its diversity jurisdiction it is interpreting state law. Consider "federal common law" if the majority indicate that it used a judge-made "doctrine" or "rule; if the Court without more merely specifies the disposition the Court has made of the case and cites one or more of its own previously decided cases unless the citation is qualified by the word "see."; if the case concerns admiralty or maritime law, or some other aspect of the law of nations other than a treaty; if the case concerns the retroactive application of a constitutional provision or a previous decision of the Court; if the case concerns an exclusionary rule, the harmless error rule (though not the statute), the abstention doctrine, comity, res judicata, or collateral estoppel; or if the case concerns a "rule" or "doctrine" that is not specified as related to or connected with a constitutional or statutory provision. Consider "Supreme Court supervision of lower federal or state courts or original jurisdiction" otherwise (i.e., the residual code); for issues pertaining to non-statutorily based Judicial Power topics; for cases arising under the Court's original jurisdiction; in cases in which the Court denied or dismissed the petition for review or where the decision of a lower court is affirmed by a tie vote; or in workers' compensation litigation involving statutory interpretation and, in addition, a discussion of jury determination and/or the sufficiency of the evidence.

Opinion:
CONWAY v. CALIFORNIA ADULT AUTHORITY et al.
No. 40.
Argued November 12, 1969
Decided December 8, 1969
Charles Stephen Ralston, by appointment of the Court, 394 U. S. 941, argued the cause and filed briefs for petitioner.
Arlo E. Smith, Chief Assistant Attorney General of California, argued the cause for respondents. With him on the brief were Thomas C. Lynch, Attorney General, and George R. Nock, Deputy Attorney General.
Per Curiam.
The petition for habeas corpus in this case, which was filed in the District Court for the Northern District of California and which was prepared by petitioner pro se, attacked the constitutionality of petitioner’s confinement in the state prison system pursuant to the California Indeterminate Sentence Law. Petitioner recited that he was convicted in 1952 on two counts of first-degree robbery and was given consecutive sentences of not less than five years each, with no maximum prescribed by law. California law provides that where no maximum term is set, the punishment shall be life imprisonment subject to the power of the California Adult Authority to “determine and redetermine” the length of time that a prisoner shall be required to serve. Cal. Penal Code §§ 671 (1955), 1168, 3020 (1956).
Petitioner asserted that in June 1961 he appeared before the Adult Authority for parole consideration, as he had done on a yearly basis during his confinement. According to petitioner, during that appearance the members of the Authority evinced an intention to extend his term beyond March 1962, the date that had been tentatively set for his discharge, solely because petitioner refused to admit his guilt. Shortly after the appearance, the Adult Authority rescinded its earlier action scheduling petitioner for release in 1962; no new date for release was fixed, and petitioner has remained in custody continuously since that time.
The petition for habeas corpus stated flatly that the appearance before the Authority in June 1961 was for routine parole consideration; petitioner claimed that he had been free from infractions of prison rules for at least a year prior to the appearance. He further declared that he was given no reason for the redetermination of his sentence, and received no notice or hearing concerning any possible basis for such action. In conclusion, petitioner stated that, “obviously, the only reason for this action was to coerce petitioner to plead guilty and not challenge his conviction after being released on discharge.”
Respondents filed no response to the petition in the District Court. That court denied the writ without a hearing, in a brief order stating that no federal questions had been presented. The Court of Appeals for the Ninth Circuit denied a certificate of probable cause to appeal for the reasons expressed by the District Court, and petitioner applied to this Court for a writ of certiorari. On the facts recited by petitioner, we granted certiorari to consider his contention that his privilege against compulsory self-incrimination had been infringed by the prison authorities. 393 U. S. 1062 (1969).
In its brief on the merits, respondents have brought to our attention a series of prison documents, whose accuracy has in no way been drawn into question by petitioner, that cast petitioner’s detention in a light wholly different from that shed by his petition for certiorari. These documents show that in December 1960 Conway was served with a notice charging him with violation of prison rules and informing him that the violation might result in a refixing of his prison term; he attended a hearing at which he was found guilty of fighting with another prisoner and was sentenced to three days in isolation, with a recommendation that his Adult Authority appearance be postponed until June 1961. Following that appearance, as petitioner notes, the Authority rescinded its earlier action fixing a determinate sentence, thereby reinstating by operation of law his initial indeterminate sentence. Thus, it now appears respondents have documentary evidence that the actual facts simply do not present the issue for which certiorari was granted by us.
That this imposition on this Court has been revealed only at this late stage seems to have been the result of the policy of the Attorney General of California, as explained in the respondents' brief, to make no response to habeas corpus petitions of state prisoners unless the court in which a petition is filed requests a response, as for example, so respondents say, by issuing an order to show cause why the writ should not be granted. Since no response eventuated in this instance and respondents also failed to flush the problem at the certiorari stage, both this Court and the attorney appointed by the Court to represent petitioner here have unwittingly been placed in the unfortunate posture of addressing a situation that does not exist.
In this state of affairs we decline to adjudicate this case. Were we to pass upon the purely artificial and hypothetical issue tendered by the petition for certiorari we would not only in effect be rendering an advisory opinion but also lending ourselves to an unjustifiable intrusion upon the time of this Court. Accordingly, the writ of certiorari is dismissed as improvidently granted.
It is so ordered.
See Cal. Penal Code § 1168 (1956) and provisions there listed.
Petitioner claimed that his discussion with the members of the Authority had turned to what he planned to do if released. When petitioner stated that he expected to go “to Bakersfield,” one member responded: “But that is where you got into this trouble. What are you planning to do there?” Petitioner declared, “I’m going to fight my case,” prompting the member to ask whether petitioner had not admitted to the Authority, two years earlier, that he was guilty. After petitioner denied the previous admission, the members raised — assertedly for the first time — the possibility of extending petitioner’s term.
In response to the petition for certiorari respondents merely locked horns with the allegations of the petition as filed, without drawing the Court’s attention to the actual facts as subsequently revealed in its brief on the merits.

Question: What is the basis of the Supreme Court's decision?

Choices:
judicial review (national level)
judicial review (state level)
Supreme Court supervision of lower federal or state courts or original jurisdiction
statutory construction
interpretation of administrative regulation or rule, or executive order
diversity jurisdiction
federal common law

Answer: 2