Which of the Following Is a Difference Between the Methodologies

Which of the following is a difference between the methodologies used by the national social scientific surveys conducted in the United States and the opinion-poll surveys that come up on news sites online?

A) Unlike the typical opinion-poll survey, social scientific surveys tend to be longitudinal studies.
B) Most online opinion-poll surveys are meant for secondary analysis, whereas the social scientific surveys are meant for primary analysis.
C) Online opinion-poll surveys allow more flexibility in their administration than the social scientific surveys.
D) The questionnaires used in online opinion-poll surveys are always broader than those used in social scientific surveys.

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