The Centers for Disease Control and Prevention Are Publishing a Report

The Centers for Disease Control and Prevention are publishing a report highlighting several important organisms causing disease in humans. Tuberculosis-a lung infection from the bacterium Mycobacterium tuberculosis Gastroenteritis-inflammation in the digestive tract caused by rotavirus Hepatitis-liver disease resulting from a blood infection with Hepatitis B virus
What common feature do these diseases share?

A) They are all chemical hazards.
B) They are all caused by respiratory infections.
C) They are all caused by pathogens.
D) All of these are correct.