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:
ARNOLD et al. v. NORTH CAROLINA.
No. 572.
Argued March 26, 1964.
Decided April 6, 1964.
J. Harvey Turner and Fred W. Harrison argued the cause and filed a brief for petitioners.
Ralph Moody, Deputy Attorney General of North Carolina, argued the cause for respondent. With him on the brief was T. W. Bruton, Attorney General of North Carolina.
Per Curiam.
The petitioners, Arnold and Dixon, were found guilty of murder by a jury and their convictions were affirmed, the Supreme Court of North Carolina concluding that they had not made out a case of systematic exclusion of Negroes from the grand jury which returned the indictment. 258 N. C. 563,129 S. E. 2d 229. In support of their motion to quash the indictment because of consistent exclusion of Negroes from grand jury service, petitioners, both Negroes, offered testimony of the county tax supervisor showing that the tax records of the county, on which Negro and white persons are listed separately and from which the names of jurors are derived, revealed 12,250 white persons and 4,819 Negroes in the county, with 5,583 white men and 2,499 Negro men listed for poll tax. In addition, the clerk of the trial court testified that while there have been as many as four or five Negroes upon the regular jury panel from which grand jurors have been chosen, in his 24 years as clerk he could remember only one Negro serving on a grand jury, another having been selected but excused. This evidence was uncontradicted, the State cross-examining the witnesses but offering no evidence.
The judgment below must be reversed. The “testimony in itself made out a prima jade case of the denial of the equal protection which the Constitution guarantees.” Norris v. Alabama, 294 U. S. 587, 591. The situation here is quite like that in Eubanks v. Louisiana, 356 U. S. 584, 586, where systematic exclusion of Negroes from grand jury duty was found. In that case:
“Although Negroes comprise about one-third of the population of the parish, the uncontradicted testimony of various witnesses established that only one Negro had been picked for grand jury duty within memory. . . . From 1936, when the Commission first began to include Negroes in the pool of potential jurors, until 1954, when petitioner was indicted, 36 grand juries were selected in the parish. Six or more Negroes were included in each list submitted to the local judges. Yet out of the 432 jurors selected only the single Negro was chosen.”
See also Hernandez v. Texas, 347 U. S, 475.

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: 1