Which of the Following Is an Example of Social Influence

Which of the following is an example of social influence?

A) You didn't do well on the test because you stayed up all night cramming.
B) You feel guilty because you persuaded your professor to raise your grade on an exam.
C) You almost fell asleep at the wheel,so you pull off the road to take a short nap.
D) You decide to postpone work because you like to sleep in.
E) When you are hungry,you have trouble concentrating.