In Applying the Cost-Benefit Principle,one Should Calculate the

In applying the cost-benefit principle,one should calculate the

A) total cost and total benefit,and choose that quantity of an activity where they are equal.
B) average cost and average benefit,and choose that quantity of an activity where the average benefit exceeds the average cost by the greatest amount.
C) total cost and total benefit,and choose that quantity of an activity where the total cost exceeds the total benefit by the greatest amount.
D) marginal cost and marginal benefit,and choose that quantity of an activity where the marginal benefit at least equals the marginal cost.
E) marginal cost,total cost,marginal benefit,and marginal cost,and choose that quantity of an activity where the marginal cost equals the total cost and the marginal benefit equals the total benefit.