Assuming That All Necessary Conditions Are Met, What Needs to Be

Assuming that all necessary conditions are met, what needs to be changed in the formula so that we can use it to construct a (1 - $\alpha$ ) confidence interval estimate for the population proportion p?

A) should be replaced by p.
B) t _$\alpha$ should be replaced by z _$\alpha$ .
C) t _$\alpha$ should be replaced by t _{$\alpha$ / 2}.
D) t _$\alpha$ should be replaced by z _{$\alpha$ / 2}.