If nothing is known about p, 0.5 can be substituted for p in the sample-size formula for a population proportion. But when this is done, the resulting sample size may be larger than needed. Under what circumstances will using pequals0.5 in the sample-size formula yield a sample size larger than needed to construct a confidence interval for p with a specified bound and a specified confidence level? Choose the correct choice below. A. Only when p equals 0.5 B. Whenever p is different from 0.5 C. Only when p equals 0 D. Only when p equals 1