The Principle of Voluntary Consent in Social Research Means

The principle of voluntary consent in social research means

A) a professor who hands out a questionnaire to students should inform students that their participation is voluntary and that they can refuse to participate without penalty.
B) many research findings actually have limited generalizability to those subjects/respondents who agree to participate in research.
C) this norm is violated in covert field research.
D) a researcher using deception should tell subjects that they can leave at any time.
E) all of the above.