In a recent poll, 71% of respondents reported that they cast votes in the most recent national election. Voting records show, however, that only 60% of eligible voters actually voted in that election.
Which of the following pieces of evidence, if true, would provide the best explanation for the apparent discrepancy?
A The margin of error for the survey was plus or minus five three percentage points.
B Fifteen percent of the survey’s respondents were living overseas at the time of the election.
C Prior research has shown that that people who actually do vote are also more likely to respond to polls than those who do not vote.
D Many people who intend to vote are prevented from doing so by last-minute conflicts on election day or other complications.
E Some people confused the national election with other recent elections when responding to the poll.
Sorry I agree that c is the best answer although e could work. I got my relationship wrong. The people who responded to the poll are also those most likely to vote so the poll would over represent the number of voters.