The U-Shaped Average Total Cost Curve Is

Multiple Choice

The U-shaped average total cost curve is

A) a result of firms' wanting to find the output level where cost is at its minimum.
B) unrealistic because average total cost always increases as output increases.
C) the result of average fixed cost falling and decreasing marginal returns as output increases.
D) a result of constant marginal returns.
E) a result of increasing marginal returns.