A familiar polling problem is the bandwagon effect, which occurs whena) the same results are used over and over again.b) polling results influence people to support the candidate marked as the probable victor in a campaign.c) polling results influence people to support the candidate who is trailing in a campaign.d) background noise makes it difficult for a pollster and a respondent to communicate with each other.e) a large number of people refuse to answer a pollster's questions.

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