Why is the marginal benefit of cleaning up pollution downward sloping?
A. The benefit can only be seen if you clean large amounts of pollution so there is little marginal benefit otherwise.
B. At first cleaning pollution makes a big difference but there are diminishing marginal returns for subsequent efforts.
C. At first you see small effects to cleaning but then see larger differences because of diminishing marginal returns.
D. Cleaning up pollution continues to cost the citizens in the area more and more.
Answer: B
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