Researchers Generally Need to Ask Three Questions When Developing a Sampling

Multiple Choice

Researchers generally need to ask three questions when developing a sampling plan.Which of the questions below is one of these three?

A) Why should respondents be selected (sampling justification) ?
B) How should participants be chosen (sampling procedure) ?
C) Who should be left out of the sample (sampling exclusion) ?
D) How should we contact the sample (sampling approach) ?
E) none of the above