Sagot :
Doctors do not administer vaccinations to people who are too sick because (option D.) the white blood cells of sick people may not be able to efficiently handle the weakened or dead form of the pathogen. The inmunization is obtained when the white blood cells attack the weakened form of the pathogen, so if the white blood cells are working against other ill then they may not be able to effeciently attack the injected pathogen.