A commercial for a breakfast cereal is shown during a certain television program. The manufacturer of the cereal wants to estimate the percent of television viewers who watch the program. The manufacturer wants the estimate to have a margin of error of at most 0.02 at a level of 95 percent confidence. Of the following, which is the smallest sample size that will satisfy the manufacturer\textquotesingle s requirements? 
选项为:A:$$40$$  B:$$50$$  C:$$100$$  D:$$1.700$$  E:$$2.500$$  请回答其中一个选项.