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, Joe’s opportunity cost of selling a car is _ than Ralph’s, and Joe’s opportunity cost of selling a car is _ than Larry’s.
A.less; greater
B.less; less
C.greater; greater
D.greater; less
正确答案:less; greater