Chanel Has the Option of Purchasing One of Three Products

Multiple Choice

Chanel has the option of purchasing one of three products: Brand A,Brand B,or Brand C.The price of each product is $10.If Chanel decides to purchase Brand A,the opportunity cost of this decision is

A) $20.
B) Brand B or Brand C,depending on which she considers to be the highest-valued alternative forgone.
C) Brand A.
D) Brand B and Brand C.
E) zero if this is a frivolous purchase with no marginal benefit.