Use the Table Below to Answer the Following Questions

Use the table below to answer the following questions.
Table 18.2.1

-Refer to Table 18.2.1. If the firm can sell all the output it wants for the price of $10 a unit, what is the profit-maximizing number of workers if the wage rate is $30?

A) 1
B) 5
C) 6
D) 8
E) 9