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

Refer to the figure below. For Chris, the opportunity cost of planting one bulb is removing:
A.1/3 of a bag of trash.
B.3 bags of trash.
C.1/25 of a bag of trash.
D.25 bags of trash.
正确答案：1/3 of a bag of trash.