A Nurse Is Aware That a Child with AIDS Is

A nurse is aware that a child with AIDS is more prone to infection than an adult with AIDS because:

A) child with AIDS is exposed to more pathogen than an adult with AIDS.
B) the immune system of a child is incapable of producing antibodies.
C) the AIDS virus attacks child's immune systems through a different mechanisms
D) a child has fewer circulating antibodies resulting from a lack of previous exposure to pathogens.