As of November 1, 2012, There Were a Total of 10

As of November 1, 2012, there were a total of 10 confirmed cases of Hantavirus infection in people who were recent visitors (mid-June to end of August, 2012) to Yosemite National Park. Three visitors with confirmed cases died. Health officials believe that 9 out of the 10 people with Hantavirus were exposed while staying in Curry Village in the Signature Tent Cabins. This is an example of

A) what the anticipated mortality rate would be if a family of five were planning to vacation in Yosemite National Park.
B) the prevalence of Hantavirus one can anticipate if he or she is going to vacation in Yosemite National Park.
C) the low rate of morbidity one can expect while traveling to Yosemite National Park.
D) the incidence of people who are at risk for developing Hantavirus while staying in Yosemite National Park.