Which One of the Following Statements About Random Sampling Is

Which one of the following statements about random sampling is INCORRECT?

A) Most studies in social sciences are conducted on random samples.
B) Nonrandom samples can be used for generalizing.
C) If some participants randomly selected for a study have refused to participate, the resulting sample is not random.
D) When a professor invites all the students attending her classes to participate in her study, the sample is not random.

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