13. Firm Plazma has the short-run total cost function C(y) = 9y2  + 144. At what quantity of output is short-run average cost minimized?
(A) 4
(B) 16
(C) 0.75
(D) 3
(E) none of the above.

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統計： A(0), B(0), C(0), D(1), E(0) #2748703