In Which of the Following Do the Mucous Membranes Serve

In which of the following do the mucous membranes serve as a portal of entry for disease?

A) a pathogen crosses from the mother to the fetus by way of the placenta.
B) A pathogen is introduced into the body when the person rubs the eye with contaminated fingers and the pathogen is washed into the nasal cavity by way of tears.
C) A person is bitten by a mosquito that carries the malaria parasite.
D) Fungi digest the outer layer of the skin.
E) A person receives an injection with a contaminated needle.