Clarke's Gas Station in Podunk Only Sells Gasoline If Customers

Multiple Choice

Clarke's gas station in Podunk only sells gasoline if customers also purchase oil.

A) This is called a tie-in sale and is in violation of antitrust laws.
B) This is not in violation of antitrust laws, as cars need both oil and gas.
C) This is not in violation of antitrust laws, as consumers get the oil below market prices.
D) This is in violation of the Robinson-Patman Act.