Which type of measure of disease frequency best describes each of the following scenarios? 

A. Percentage of students enrolled in a college who developed influenza during the spring semester of 2009. 
B. Percentage of students enrolled in an epidemiology class who had sore throats on the first day of class. 
C. Percent of breast cancer patients who underwent mastectomy during 2008. 
D. Percent of men found to have high blood pressure at their yearly physical. 
E. Number of newly-diagnosed cases of AIDS in a year per 100,000 persons. 
F. Percent of drivers found to be legally drunk at the time of their car accident.