When thinking about GREs, applying to graduate school, and studying for mid-terms, all in the next two months, Nichole starts to have sweaty palms and a racing heart. It is most probable that Nichole is responding to .
1. pressure
2. conflict
3. frustration
4. issues of control

1. pressure

Explanation:

Pressure can be said to be the psychological stress that occurs when you are in a situation that requires you to perform, of which the outcome is dependent on your performance is dependent. This expectation to perform brings about this pressure you feel in form of psychological stress.

From the information given in the question above, we can imply that Nichole is most probably responding to pressure.