Which Portion of the Marginal Cost Curve Is Used to Create

Multiple Choice

Which portion of the marginal cost curve is used to create a firm's short-run supply curve?

A) the entire marginal cost curve
B) the marginal cost curve above its intersection with the average variable cost curve because below this price, firms will shut down in the short run
C) the marginal cost curve above its intersection with the marginal revenue (demand) curve
D) the marginal cost curve above its intersection with the average total cost curve because below this price, firms will shut down in the short run