An Epidemiologist Wishes to Undertake a Research on the Spread

An epidemiologist wishes to undertake a research on the spread of hepatitis C (HCV) in a nation with poor healthcare resources. She has access to a cohort of newly diagnosed HCV adults as well as an age-matched cohort of HCV-negative people. She intends to undertake a case-control study with these two adult cohorts. Which of the following measures of interest would be most suited for this researcher's study?

A) The average death rate in each cohort
B) The frequency of past blood transfusions in each cohort
C) The incidence rate of liver cancer in HCV-positive participants
D) The rate of eventual HCV infection in HCV-negative participants
E) The rate of treatment-related adverse effects in HCV-positive participants