The distribution of the times between when the renewal notice for an automobile insurance policy is issued and the policy is renewed is roughly

The distribution of the times between when the renewal notice for an automobile insurance policy is issued and the policy is renewed is roughly bell-shaped with mean 23 and standard deviation of 2 days. The proportion of policies that are renewed in less than 21 days is about

A.84

B.68

C.32

D.50

E.16