Context: Isaac Newton was born in the 1600s and studied how objects move. He discovered three fundamental laws about forces and motion. According to Newton's third law, for every force, there is an equal and opposite force.
Consider the following force:
A rolling pin is pushing on a mound of cookie dough.
According to Newton's third law, what other force must be happening?
A. The mound of cookie dough is pushing on the rolling pin.
B. The mound of cookie dough is pulling on the rolling pin.
Determine the correct option from the provided choices and reply with its corresponding letter.

A