Suppose a Cat Has Learned to Push Against a Pole

Suppose a cat has learned to push against a pole in order to escape from a puzzle box, like one of Thorndike's. What procedure would lead to the extinction of this response?

A) On the next few trials, open the box before the cat has a chance to push against the pole.
B) On the next trial, give the cat a shock as soon as it touches the pole.
C) On the next trial, give the cat a shock as soon as it gets out of the box.
D) Let the cat push against the pole many times without opening the box.