单选题 The short-run supply curve to a firm operating under perfect competition is most accurately described as the segment of the:

A、 marginal cost curve below the average total cost curve.
B、 average total cost curve above the marginal cost curve.
C、 marginal cost curve above the average variable cost curve.

【正确答案】 C

【答案解析】The short-run supply curve for a firm under perfect competition is the segment of its marginal cost (MC) curve above the average variable cost (AVC) curve.