答案:C
解析:
Choice D is correct. Since Yves picked 75 apples and picks approximately 50 apples per hour, it can be determined that he picked apples for 75/50=1.5 hours.
Because the apple orchard charges $8.50 per hour, Yves can expect to be charged $8.50*1.5=$12.75.
Yves can expect the apple orchard to charge him $12.75.