The State of California Reported a Total of 1904 Cases

The state of California reported a total of 1904 cases of pertussis (whooping cough) for all of the year 2013, 12% of which involved infants younger than 6 months. Infants this young cannot be vaccinated yet and must rely on herd immunity for protection from the virus. If we took many random samples of 100 California residents diagnosed with pertussis in 2013 and computed the proportion in each sample who are infants, what would the distribution of these values be

A) the sampling distribution of the proportion who are infants.
B) the sampling distribution of infants diagnosed with pertussis.
C) a Normal distribution because of the law of large numbers.
D) the population distribution of infants diagnosed with pertussis.