The Data in the Table Is for a Firm in Which

The data in the table is for a firm in which labour is the only variable cost and each unit of labour costs the same regardless of how many units are bought.

-Refer to the information above to answer this question.What are the missing numbers for AP in the fourth column?

A) 20,25,20,17.5 and -5.
B) 20,15,20,17.5 and -5.
C) 10,15,20,16.9 and 13.
D) 10,25,25,16.9 and 0.
E) 10,20,20,17.5 and -5.