What Is the "Social Desirability Effect

What is the "social desirability effect"?

A) The bias in surveys that comes from the failure of pollsters to interview respondents from lower socioeconomic backgrounds.
B) The strong desire that people have to express their opinions to survey researchers.
C) The fact that respondents report what they think the interviewer wishes to hear or whatever they think is socially acceptable rather than what they actually believe.
D) The impression conveyed by polls that something is important to the public when actually it is not.