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:
FRI, ACTING ADMINISTRATOR, ENVIRONMENTAL PROTECTION AGENCY v. SIERRA CLUB et al.
No. 72-804.
Argued April 18, 1973
Decided June 11, 1973
Deputy Solicitor General Wallace argued the cause for petitioner. With him on the briefs were Solicitor General Griswold, Assistant Attorney General Frizzell, Harriet S. Shapiro, Edmund B. Clark, and Martin Green.
Bruce J. Terris argued the cause for respondents. With him on the brief were Helen C. Needham, Nathalie Vayssie Black, and James W. Moorman.
Briefs of amici curiae urging reversal were filed by Mark Wilmer, Rex E. Lee, Gary K. Nelson, Attorney General, J. A. Hughes, John Conway, William Duncan, Gordon Pearce, Richard G. Campbell, Lawrence V. Robertson, Jr., and Donald E. Dickerman for the State of Arizona and Ten Named Public Utilities; by Andrew P. Miller, Attorney General, and C. Tabor Cronk, Assistant Attorney General, for the Commonwealth of Virginia; by Milton A. Smith and Stanley W. Schroeder for the Chamber of Commerce of the United States; by Cameron F. MacRae, G. S. Peter Bergen, and Henry V. Nickel for the Edison Electric Institute; and by Edward A. McCabe, Laurence P. Sherfy, and David W. Miller for the American Mining Congress.
Briefs of amici curiae urging affirmance were filed by Evelle J. Younger, Attorney General, pro se, Robert H. O’Brien, Assistant Attorney General, and Nicholas C. Yost, Anthony M. Summers, and C. Foster Knight, Deputy Attorneys General, for the Attorney General of California; by William J. Scott, Attorney General, Fred F. Herzog, First Assistant Attorney General, and Harvey M. Sheldon, Assistant Attorney General, for the State of Illinois; by Frank J. Kelley, Attorney General, Robert A. Derengoski, Solicitor General, and Jerome Maslowski, Stewart H. Freeman, and Charles S. Alpert, Assistant Attorneys General, for the State of Michigan, joined by Warren Spannaus, Attorney General, and Curtis D. Forslund, Solicitor General, for the State of Minnesota; by Louis J. Lejkowitz, Attorney General, Samuel A. Hirshowitz, First Assistant Attorney General, and Philip Weinberg and James P. Corcoran, Assistant Attorneys General, for the State of New York; by John L. Hill, Attorney General, Larry F. York, First Assistant Attorney General, and Mike Willatt, Phil Maxwell, and Troy C. Webb, Assistant Attorneys General, for the State of Texas; by David L. Norvell, Attorney General, for the State of New Mexico, joined by the Attorneys General for their respective States as follows: William J. Baxley of Alabama, Robert Killian of Connecticut, Robert L. Shevin of Florida, Vern Miller of Kansas, William J. Guste, Jr., of Louisiana, Jon A. Lund of Maine, Robert H. Quinn of Massachusetts, Louis J. Lejkowitz of New York, Robert Morgan of North Carolina, William J. Brown of Ohio, Lee L. Johnson of Oregon, Israel Packel of Pennsylvania, Kermit A. Sande of South Dakota, John L. Hill of Texas, and Kimberley B. Cheney of Vermont; by Norman Redlich for the cities of New York and Boston; by Aljred S. Forsyth for the Association of the Bar of the city of New York; by David H. Getches for the Jicarilla Apache Tribe of Indians et ah; and by Neal A. Jackson, and James F. Bromley for Natural Resources Defense Council, Inc., et al.
Per Curiam.
The judgment is affirmed by an equally divided Court.
Mr. Justice Powell took no part in the decision of this case.

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