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:
GRAVITT, EXECUTRIX et al. v. SOUTHWESTERN BELL TELEPHONE CO. et al.
No. 76-1036.
Decided April 25, 1977
Per Curiam.
This tort action was removed from the Texas state courts to the United States District Court on the grounds of diversity of citizenship but was remanded as having been “improperly removed” when it seemed that there was not complete diversity among the parties. The Court of Appeals for the Fifth Circuit, by mandamus, ordered the District Court to vacate its remand order because the latter had employed erroneous principles in concluding that it was without jurisdiction.
The Court of Appeals erred. Title 28 U. S. C. § 1447 (c) provides for remanding a removed action when the district court determines that “the case was removed improvidently and without jurisdiction”; and when a remand has been ordered on these grounds, 28 U. S. C. § 1447 (d) unmistakably commands that the order “remanding a case to the State court from which it was removed is not reviewable on appeal or otherwise . . . .” The District Court’s remand order was plainly within the bounds of § 1447 (c) and hence was unreviewable by the Court of Appeals, by mandamus or otherwise. Thermtron Products, Inc. v. Hermansdorfer, 423 U. S. 336 (1976), is not to the contrary, for there the District Court remanded “on grounds wholly different from those upon which § 1447 (c) permits remand." Id., at 344. Thermtron did not question but re-emphasized the rule that § 1447 (c) remands are not reviewable.
The petition for certiorari is granted, the judgment of the Court of Appeals is reversed, and the case is remanded for further proceedings consistent with this opinion.
Reversed and remanded.

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: 3
2