If a Person Gives a Gift to Another Person,an Economist

Multiple Choice

If a person gives a gift to another person,an economist would say that it is because

A) the marginal benefit of giving the gift is at least as great as the marginal cost of giving the gift.
B) the marginal cost of giving the gift is at least as great as the marginal benefit of giving the gift.
C) he expects to receive a gift in return.
D) none of the above