Leukopenia is a disease in which the body has less than the normal number of white blood cells. what effect would leukopenia have on the health of a person?
a. greater chance of brain disorder
b. increased sensitivity to light
c. increased risk of heart failure
d. greater susceptibility to infections

The correct answer is D.

The decrease in white blood cell count in the human blood is known as leukopenia. This disease affects the body's ability to counter diseases and infections. A low blood count can result in the affected person becoming very susceptible to infections.

The primary function of white blood cells in the body is to fight and neutralize infections. Once the white blood   cell count  significantly  dips below the normal level, the body's defense is compromised  and so becomes susceptible  to  infections.