Which of the following statements most accuratelydescribes the shapes of the average variable cost (AVC) and average total cost (ATC) curves over a wide range of output?

A.The AVC curve and the ATC curve are both U-shaped.

B.The AVC curve declines throughout;the ATC curve is U-shaped.

C.The AVC curve is U-shaped;the ATC curve increases initially then declines.