Which of the following best describes the impact that infectious agents in one’s surroundings can have on the health of an individual?

A) They can bind with T cells and cause swelling and inflammation.

B) They can attack within cells and elicit a cell-mediated immune response.

C) They can destroy the body’s ability to fight infection after repeated exposure.

D) They can produce histamine and prevent body cells from reproducing.

I think it's C but I'm not sure