Consider a Firm's Short-Run Cost Curves

Multiple Choice

Consider a firm's short-run cost curves.If average total cost is increasing as output rises,then

A) total fixed costs must be increasing.
B) average fixed costs must be increasing.
C) average variable cost must be increasing.
D) marginal cost must be below average total cost.
E) average total cost is no longer equal to the sum of average variable cost and average fixed cost.