The short-run supply curve of a perfectly competitive firm
A. Is equal to that portion of the short-run marginal cost curve that is above the average variable cost curve
B. Is equal to that portion of the short-run marginal cost curve that is above the average total cost curve
C. Is equal to that portion of the short-run average total cost curve that is above the average variable cost curve
D. None of the above
Answer: Option A

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