问题
单项选择题
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.
答案
参考答案：C
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.