Final answer:
The therapist is most likely to interpret the patient's behavior as avoiding discussing his father (option 3).
Step-by-step explanation:
The therapist is most likely to interpret the patient's behavior as avoiding discussing his father (option 3). This interpretation suggests that the patient has unresolved issues with his father and is uncomfortable talking about him, leading them to change the topic or claim that the father is irrelevant. This behavior indicates a defense mechanism to protect their emotions in the short term, but it may cause unhappiness and alienation later in life.