What Is the Reason That Infectious Disease Is Such a Problem

Multiple Choice

What is the reason that infectious disease is such a problem for settled people?

A) Many settled agriculturalists were malnourished.
B) More people living together means more chances for disease transmission.
C) With sedentism, there are more resevoirs of disease.
D) Trade between settlements provides an opportunity for a pathogen to travel.
E) All of the answers are correct.