In the short run, the competitive firms supply curve is the portion of the marginal cost curve that lies above the average variable cost curve?

A. upward-sloping portion of the average variable cost curve

B. Upward-sloping portion of the average total cost curve

C. portion of the marginal-cost curve that lies above the average variable cost curve

D. entire marginal cost curve.

E. portion of the marginal cost curve that lies above the average total cost curve.

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