City Officials Want to Estimate the Proportion of Visitors Who

City officials want to estimate the proportion of visitors who are repeat visitors to the Rideau Canal Skateway. They take a sample of 400 visitors and find that 100 are on a second visit. The 95% confidence interval is

A) 0.2076 to 0.292.
B) 0.1942 to 0.3058.
C) 0.2144 to 0.2856.
D) 0.1996 to 0.3004.
E) 0.2222 to 0.2777.