Question

Why do epidemiologists study health concerns as diverse as salmonella and AIDS? A. Epidemiologists are concerned with the patterns, causes and effects of all diseases, illnesses, and health conditions. B. Epidemiologists are exclusively focused on the causes of all diseases and health concerns so that they can stop them at onset. C. Epidemiologists care a great deal about the study of genetic disorders and study family patterns closely. D. Epidemiologists are concerned with containing infectious diseases, and therefore study the causes and patterns of them.

Answer 1

Epidemiologists are scientists who study diseases within populations of people. In essence, these public health professionals analyze what causes disease outbreaks in order to treat existing diseases and prevent future outbreaks.

Therefore the most precise answer is

D) it states both their analytical work (to study causes and patterns) and also what they pretend to achieve(to contain or treatment) but doesn't fully answer the question "Why their concern is so diverse"

A) Does not only give a full valid definition but answers the question "why they concern is so diverse (extensive)?"
because they study "ALL" diseases..

Thus, the correct answer is A

Answer 2

As the previous person already said, the correct for Apex is A.