In a Research Study Involving Medical Students, Lymphocyte Levels Were

In a research study involving medical students, lymphocyte levels were measured just before final exam week, and again during final exam week.In this study, the researchers found that during the final exam week, the medical students:

A) had more lymphocytes in their blood
B) had the same number of lymphocytes, but the lymphocytes were less active
C) had fewer lymphocytes in their blood
D) had the same number of lymphocytes, but the lymphocytes were more active