Which of the Following Is an Example of Incidence in Epidemiology

Which of the following is an example of incidence in epidemiology?

A) The number of existing cases of lung cancer in a specific county during a year
B) The number of previous cases of lung cancer in a specific county over the last year
C) The number of new cases of lung cancer in a specific county in one year's time
D) The number of deaths from lung cancer in a specific county over the course of a year