Which of the following is most likely a characteristic of a person with a weakened immune system?
A. T cells are very active in fighting infections.
B. The body replaces T cells as quickly as those cells die.
C. Opportunistic infections make the person very sick.
D. White blood cells produce many antibodies.
C. Opportunistic infections make the person very sick. Because and opportunistic infection is an infection that would not normally happen yet would appear in someone with a weakened immune system
