OE:
The argument may be summarized as follows:
Exit poll: 4/5ths said they would vote for candidate who uses wheelchair
Conclusion: poll may overestimate those who would vote for a candidate who uses a wheelchair
It is helpful before proceeding to the answer choices to attempt to anticipate the missing portion of the argument: an unstated premise that would support our conclusion. Why would the poll have overestimated those who would vote for a candidate who uses a wheelchair? Perhaps because voters, wanting to look good for the pollster, were not truthful in answering the pollster’s questions.
A: This explains why the poll would have overestimated the proportion of voters who would vote for a candidate who uses wheelchair. Correct.
B: This choice implies that people who would vote for a candidate who uses wheelchair told the pollster they wouldn’t, which would cause the poll to undercount, not overcount, the proportion of voters who would vote for a candidate who uses wheelchair. Incorrect.
C: Providing additional information about people who reported that they would not vote for a candidate who uses wheelchair does not support the conclusion that the proportion of people who said they would vote for a candidate who uses a wheelchair was overestimated. Incorrect.
D: The conclusion is about registered voters; this statement is irrelevant. Incorrect.
E: The idea that voters who claimed that they would not vote for a candidate who uses wheelchair might change their minds under some circumstances supports the idea that the proportion of voters who would vote for a candidate who uses wheelchair has been undercounted, not overcounted. Incorrect.