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:
BOSTON METALS CO. v. THE WINDING GULF et al.
No. 70.
Argued March 1, 1955.
Decided May 16, 1955.
John H. Skeen, Jr. argued the cause for petitioner. With him. on the brief was Eugene M. Feinblatt.
Charles S. Bolster argued the cause for respondents. With him on the brief were Seymour P. Edgerton, Robert Haydock, Jr. and Theodore R. Dankmeyer.
Mr. Justice Black
delivered the opinion of the Court.
The petitioner, Boston Metals Company, brought this suit in admiralty against the steam vessel Winding Gulf and her owners to recover for loss of its obsolete destroyer which sank after colliding with the Winding Gulf. The collision occurred while the destroyer was being towed by the tug Peter Moran; the destroyer itself was without power or crew. The owners of the Winding Gulf filed a cross-libel against petitioner, charging that the collision was due to unseaworthiness of the destroyer. After hearings, the District Court found that the collision was due to negligent navigation by the Winding Gulf, to inadequate lights on the destroyer and absence of a crew on the destroyer to keep its lights brightly burning. This absence of lights and crew the District Court found was the fault of the master of the tug Peter Moran. The tug master’s negligence, however, was imputed to the petitioner because of provisions in the towage contract that the master and crew of the tug would become the servants of the petitioner and that the towing company would not be responsible for their negligent towage. On this basis, the District Court entered a decree in favor of the cross-libellant against petitioner which resulted in dividing the damages equally between petitioner and respondents. 72 F. Supp. 50. The Court of Appeals affirmed on the same grounds. 209 F. 2d 410. We granted certiorari. 348 U. S. 811.
In Bisso v. Inland Waterways Corp., decided today, ante, p. 85, we held invalid a contract designed to shift responsibility for a towboat’s negligence from the towboat to its innocent tow. That holding controls this case. For whatever this contract said, here as in the Bisso case, the persons who conducted these towing operations were in fact acting as employees of the towing company, not as employees of the owner of the tow. Under these circumstances it was error to hold petitioner liable for negligence of the towing company’s employees. Cf. The Adriatic, 30 T. L. R. 699.
Reversed.
Mr. Justice Harlan took no part in the consideration or decision of this case.
[For opinion of Mr. Justice Douglas, concurring, see ante, p. 95.]

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: 6