Refer to the figure below. For Pat, the opportunity cost of planting one bulb is removing:

Refer to the figure below. For Pat, the opportunity cost of planting one bulb is removing:
A.1/5 of a bag of trash.
B.20 bags of trash.
C.1/20 of a bag of trash.
D.5 bags of trash.
正确答案：1/5 of a bag of trash.