In the above figure, when 2000 bicycles are produced each month, we can see that
选项：

A:the marginal benefit from another bicycle is greater than the marginal cost of another bicycle.
B: more bicycles should be produced to reach the allocatively efficient level of output.
C: the economy is very efficient at the production of bicycles because the marginal benefit exceeds the marginal cost.
D: Both answers A and B are correct.