Confirmation Bias Has Been Demonstrated to Occur When

Confirmation bias has been demonstrated to occur when

A) college student research participants are given a hypothesis (e.g.,"this person is extraverted") to test,and they are not able to verify it.
B) experienced psychotherapists always make correct diagnoses of their clients.
C) people evaluate themselves in response to questions such as "are you happy with your social life?"
D) people evaluate themselves in response to questions such as "are you unhappy with your social life?"