By the Accelerator Hypothesis,if a Firm's Actual Sales Jump in One

By the accelerator hypothesis,if a firm's actual sales jump in one period to a higher maintained level,that firm's capital stock

A) also jumps in one period to a higher maintained level.
B) gradually drifts upward to a higher maintained level.
C) jumps upward and then falls back to zero.
D) jumps upward and then falls back part of the way.