Ethical behavior by therapists is important because

clients share personal information

clients don't expect to get better during therapy

therapy is ineffective

therapy is complex

ITS NOT D

I think it's clients don't expect to get better during therapy

the answer is A: clients share personal information

Explanation:

Ethical behaviour by therapists is really important because the client trusts them with their personal information which should always be kept personal and secret by the therapists. This is considered to be a part of ethical behaviour. Thus the answer is: clients share personal information.