Which of the Following Is an Example of the Mucous

Which of the following is an example of the mucous membranes serving as a portal of entry for disease?

A) an injection with a contaminated needle
B) a bite by a mosquito that carries the malaria parasite
C) digestion of the outer layer of the skin by fungi
D) the crossing of a pathogen from the mother to the fetus by way of the placenta
E) tntroduction into the body by rubbing the eye with contaminated fingers and washing into the nasal cavity by way of tears