Give a brief description of the factors involved in understanding the etiology of a disease.

Relatedly, when disease is widespread, epidemiological studies investigate what associated factors, such as location, sex, exposure to chemicals, and many others, make a population more or less likely to have an illness, condition, or disease, thus helping determine its etiology.  

Location, sex, and exposure to chemicals make a population more or less likely to have an illness. This helps determine the etiology when the disease is widespread.

answer: the answer is b