In Economics,we Assume a Rational Person Will Choose to Do

In economics,we assume a rational person will choose to do an activity:

A) if the opportunity costs outweigh the benefits of doing so.
B) if the sunk costs outweigh the benefits of doing so.
C) if the sunk and opportunity costs combined outweigh the benefits of doing so.
D) if the opportunity costs do not outweigh the benefits of doing so.