It's Important to Avoid Multiple Roles in a Counseling Relationship

It's important to avoid multiple roles in a counseling relationship because:

A) The client has enough roles to work through.
B) The therapist plays too many roles already.
C) There is always a power differential between the client and the therapist.
D) It becomes too easy for the client to take advantage of his or her therapist.
E) Both c and d.