The Graph Below Illustrates the Average and Marginal Product of Labour

The graph below illustrates the average and marginal product of labour for Get Smart Enterprises.

-Refer to the graph above to answer this question.How many units of labour does the firm need to employ to achieve an output that minimizes average variable cost?

A) 1.
B) 3.
C) 6.
D) 9.
E) 12.