3.A firm's U-shaped long-run average costs indicates the firm experiences.

Select one:

A.Increase returns to scale at low levels of output, then constant returns to scale, and eventually decreasing returns to scale as output level increases.

B.Constant returns to scale at low levels of output, then increasing returns to scale, and eventually decreasing returns to scale as output level increases.

C.Decreasing returns to scale at low levels of output, then constant returns to scale, and eventually decreasing returns to scale as output level increases.

Constant returns to scale at low levels of output, then decreasing returns to scale, and eventually increasing returns to scale as output level increases