You are going to create a 95\% confidence interval fora population proportion and want the margin of error to be no more than 0.05. Historical data indicate that the population proportionis about 0.7. What is the minimum size random sample you need to construct this interval? 
选项为:A:$$385$$  B:$$322$$  C:$$274$$  D:$$275$$  E:$$323$$  请回答其中一个选项.