Assume that a consumer has a given budget or income of $24 and that she can buy only two goods, apples or bananas. The price of an apple is $3.00 and the price of a banana is $2.00. For this consumer, the opportunity cost of buying one more apple is

A. 0.67

B. 0.50 of a banana

C. 1 banana

D. 1.5 bananas