You're interested in drawing some conclusions about the political attitudes of college undergraduates. Your objective is to administer a survey to a...

You're interested in drawing some conclusions about the political attitudes of college undergraduates. Your objective is to administer a survey to a representative sample of students. You survey a large group of seniors who are attending a senior-only event. The flaw in this approach is:

 A.Your approach will produce anecdotal rather than available data. B.It's likely that using this approach will only identify a sample of males. C.It's necessary to set up an experiment with control and treatment conditions to properly collect representative data. D.By choosing only seniors, your sample won't be a representative sample of students. E.There's no way to ensure that your sample will be representative of all college seniors.