There Were 27 Students at the Picnic, of Which 18

There were 27 students at the picnic, of which 18 developed illness. The attack rate was thus nearly 67%. What does this mean?

A) The attack rate describes the number of susceptible people who become ill in a population after exposure to an infectious agent, in this case 67%.
B) The attack rate is the number of new cases in a specific time period in a given population, in this case 27.
C) This describes the number of people in a defined population who die during a given period, in this case nearly 18%.
D) The attack rate is the total number of cases at any time or for a specific period in a given population, in this case 27.
E) It describes the situation in which a particular disease arises from several genera of a person's own normal microbiota, in this case 18.

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