Katzenbach v. McClung involved a restaurant that served food to black customers only at take-out windows. White customers would be seated. The Supreme Court held that the:

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Katzenbach v. McClung (also known as McClung v. Katzenbach or the Ollie's Barbecue case) is a landmark case that dealt with the Civil Rights Act of 1964, not the amendments or clauses mentioned in the other choices. The Supreme Court held that the restaurant's practices affected interstate commerce, thus Congress had the authority to regulate it under the Commerce Clause, not the Tenth Amendment, Fourteenth Amendment, Necessary and Proper Clause, or considerations of the commerce's triviality.

Katzenbach V