Which of the following predictions is the most accurate about a person who has normal external barriers and specific internal defenses but lacks nonspecific internal defenses?

A) He won't get sick because the specific defenses will kill invading pathogens.
B) He will have many more infections than normal.
C) Invading microbes will be able to enter through the respiratory tract.
D) He won't get sick because the external barriers will keep out pathogens.