(A) the cost incurred in the past before we make a decision about what to do in the future. (X)
(B) a cost that cannot be avoided. regardless of what is done in the future (X)
(C) that which we forgo, or give up, when we make a choice or a decision. ()
(D) the additional benefit of buying an additional unit of a product (X)
Answers: Opportunity cost is that which we forgo, or give up, when we make a choice or a decision.