In the context of public opinion polls, what is self-selection?
a. a reference to short-term studies of the electorate invalidated by long-term biases
b. a reference to highly motivated respondents who decide for themselves whether or not to participate in surveys
c. a reference to long-term studies of the electorate invalidated by short-term biases
d. a reference to underrepresented groups in public opinion polls that may bias survey results
e. a reference to the timing of public opinion polls that may skew survey results
Answer: B
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