A Perfectly Competitive Firm's Short-Run Supply Curve Is the Same

A perfectly competitive firm's short-run supply curve is the same as:​

A) the supply curve of all the other firms in the industry.
B) the upward-sloping portion of its marginal cost curve.
C) the portion of its marginal cost curve above the minimum average variable cost.
D) the portion of its average variable cost curve above the average total cost curve.
E) the market demand curve.