Final answer:
In this situation, it would be best to include the entire family in therapy as the issue of incest between the father and daughter affects the family system as a whole.
Step-by-step explanation:
In this situation, it would be best to include the entire family in therapy as the issue of incest between the father and daughter affects the family system as a whole (Option B).
Family therapy provides an opportunity for open communication, understanding, and healing among family members. It allows everyone to participate in the process and address the underlying dynamics and conflicts within the family.
By involving the entire family, the therapist can work towards rebuilding trust, promoting healthy relationships, and supporting the wellbeing of all members.