The Following Figure Depicts a Firm's Long-Run Average Total Cost

The following figure depicts a firm's long-run average total cost and selected short-run average total cost curves.

-Refer to the figure above.The firm is currently producing at point A.If it increases its employment of labor,it will move toward ________.

A) any point on the short-run average total cost curve
B) point B
C) point C
D) point D