Fact Pattern Thermo Gas,Inc. ,And Uno Oil Corporation Refine and Sell Gasoline

Multiple Choice

Fact Pattern
Thermo Gas,Inc. ,and Uno Oil Corporation refine and sell gasoline and other petroleum products.To limit the supply of gas on the market and thereby raise prices,Thermo Gas and Uno Oil agree to buy "excess" supplies from dealers and "dispose" of it.
-Refer to Fact Pattern 28-1B.The agreement between Thermo Gas and Uno Oil to buy "excess" supplies from dealers and "dispose" of it is

A) a horizontal restraint.
B) a refusal to deal.
C) a resale price maintenance agreement.
D) a vertical restraint.