Assuming that a vaccine against hepatitis C was developed. To evaluate the effectiveness of this vaccine, the population that should be selected as the research object is
A.
People infected with hepatitis C
B.
People with low incidence of hepatitis C
C.
People who have been infected with hepatitis C and have antibodies in their bodies
D.
High-risk population of hepatitis C
E.
People who have been infected with hepatitis B