Two studies were completed in florida. one study in northern florida involved 2,000 patients; 64% of them experienced flulike symptoms during the month of december. the other study, in southern florida, involved 3,000 patients; 54% of them experienced flulike symptoms during the same month. which study has the smallest margin of error for a 95% confidence interval?

a. the northern florida study with a margin of error of 1.8%.
b. the southern florida study with a margin of error of 1.8%.
c. the northern florida study with a margin of error of 2.1%.
d. the southern florida study with a margin of error of 2.1%.