A national survey of asthma conducted on May 1, 2012, obtained the following results for the state of Oklahoma: X = The number of residents with asthma Y = The population of the state on June 30, 2012, and all members of the population were considered at risk Z = The number of new cases of asthma diagnosed during 2012. The incidence rate of asthma during 2012 (per 100,000) would be expressed as:________
A. (X/Y) x 100,000.
B. (Z/X) x 100,000.
C. (Z/Y) x 100,000.
D. (X/Z) x 100,000.
E. None of these is correct.