Suppose the Marginal Cost Curve in the Short Run First

Multiple Choice

Suppose the marginal cost curve in the short run first decreases, then reaches a minimum, and then increases.If we are at an output where marginal cost is decreasing, then:

A) marginal product must be increasing.
B) average variable cost must be decreasing.
C) average total cost must be increasing.
D) marginal product must be increasing and average variable cost must be decreasing.