A researcher wishes to know, with 98% confidence, the percentage of women who wear shoes which are too small for their feet. A previous study conducted by Academy of Orthopedic Surgeons found that 80% of women wear shoes that are too small for their feet. If the researcher desires her estimate to be in 3% of the true proportion, how large a sample is necessary?
A. 966
B. 683
C. 183
D. 484