Dent ‘n’ Scratch Used Cars and Trucks employs 3 salesmen. Data for their sales last month are shown in this table:Based on last month’s data, Ralph’s opportunity cost of selling a truck is selling:

Dent ‘n’ Scratch Used Cars and Trucks employs 3 salesmen. Data for their sales last month are shown in this table:Based on last month’s data, Ralph’s opportunity cost of selling a truck is selling:
A.1/4 of a car.
B.3 cars.
C.4 cars.
D.1/3 of a car.
正确答案：1/4 of a car.