The Table Below Shows Output,marginal Cost,and Average Variable Cost for the Production

Multiple Choice

The table below shows output,marginal cost,and average variable cost for the production of pairs of shoes.All costs are in dollars.
TABLE 7-6
-Refer to Table 7-6.The firm's marginal product of its variable factor is maximized when it produces ________ units of output.

A) 50
B) 90
C) 100
D) 110
E) 170