Natasha Is a Medical Student Who Is Studying for Her

Natasha is a medical student who is studying for her final exams. She begins taking extra vitamins and makes sure she maintains exercise levels. Her behaviour can best be explained by the fact that she

A) is a hypochondriac.
B) knows the effect that stress has on the immune system.
C) is worried about passing her classes.
D) all of the above
E) none of the above