MoveOn. org, a political activism website, often includes members of its large mailing list in organizational decisions such as fundraising strategy adjustments or endorsements of political candidates. An email is sent to the millions of MoveOn members who have shared their email address; the email contains a link to a poll asking for input on the decision. Members can simply click through to the poll to submit their responses. Which of the following statements about MoveOn. org’s sampling methodology is most accurate? Their sample is based on voluntary response, so it likely does not represent the membership as a whole.

Their sample is based on voluntary response, so it can be assumed to represent the membership as a whole if a large enough number of responses are obtained.

Their sample is actually a census since the entire membership list receives the email.

Their sample is a convenience sample, so it can be assumed to represent the membership as a whole if a large enough number of responses are obtained.

Their sample is a convenience sample, so it likely does not represent the membership as a whole.