A researcher worked with members of a political action committee (PAC)to survey potential voters by telephone before an election.PAC members conducted the poll themselves while the researcher tabulated the results.The poll asked which candidate people plan to vote for in the upcoming election.Which of the following may present problems for the accuracy of the results?

Question

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All of these may present problems for the accuracy of the results. 
B) The question asks for a binary response and does not leave room for "undecided" voters or third-party candidates.
C) The scheduled rally may cause bias in favor of that candidate.
E) Using only telephone directories may result in a biased sample that does not accurately represent the population. 
Additionally, the fact that the PAC members conducted the poll themselves may also introduce bias.

A Researcher Worked with Members of a Political Action Committee