The Key Issue in Selecting the Case for a Case

The key issue in selecting the case for a case study is to

A) decide what phenomenon you want to be able to say something about at the end of the study.
B) construct specifications for a case that would reflect the phenomenon to an extreme extent.
C) find gatekeepers who have access to a range of instances of possible cases.
D) identify a field setting in which the researcher already is a participant.