Below Is a Graphical Illustration of Nearly Done Inc

Below is a graphical illustration of Nearly Done Inc.'s marginal revenue product.The firm employs its labour in a perfectly competitive labour market.

-Refer to the above information to answer this question.What quantity of labour is Nearly Done Inc.employing when the marginal product of labour is maximized?

A) 2.
B) 4.
C) 6.
D) 8.
E) Cannot be determined.