A Nurse Who Works in a Clinic Has Been Asked

A nurse who works in a clinic has been asked by the doctor who owns the clinic to participate in a study he is conducting. She agrees to participate but and later wishes to leave the study but feels uncomfortable asking to do so. This is an example of:

A) Fundamental ambiguity principle
B) Coercive pressure to participate
C) Participatory rights syndrome
D) Breach of confidentiality