This Graph Shows the Marginal Costs and Marginal Benefits Associated

Multiple Choice

This graph shows the marginal costs and marginal benefits associated with roadside litter clean up.Assume that the marginal cost and marginal benefit curves slope in the usual directions.
Refer to the information given above.According to this graph,the marginal benefit of litter removal is maximized when the ___ bag is removed.

A) first
B) 10^th
C) 15^th
D) 30^th