The Market for Sweet Potatoes Consists of 1,000 Identical Firms $q = P / 200 - .5$

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 short-run supply curve?

A) $q = P / 200 - .5$ for P?100, and q=0 otherwise.
B) $q = P / 100 ^ { - .5 }$ for P?200, and q=0 otherwise.
C) $P = 100 + 200 q$
D) $q = P / 200 ^{- .5}$ for P ?200, and q=0 otherwise.