The Market for Sweet Potatoes Consists of 1,000 Identical Firms $A N S C = 100 + 100 q$

The market for sweet potatoes consists of 1,000 identical firms. Each firm has a short-run total cost curve of STC = 100 + 100 q + 100q², and a short-run marginal cost curve of SMC=100+200q, where q is output. Suppose that sunk costs are 75 and nonsunk costs are 25. What is the equation of an individual firm's average nonsunk cost curve?

A) $A N S C = 100 + 100 q$
B) $\text { ANSC } = 100 + 100 q + 25 / q$
C) $A N S C = 25 / q$
D) $\text { ANSC } = 100 + 200 q + 25 / q$