What is "social desirability bias"?

Select one:

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