Explanation:

The correct answer to the question is "will have been watching." Let us break down this answer to understand it better.

1. Future Perfect Tense: The sentence is in the future perfect tense, which is used to talk about actions that will be completed at a specific time in the future. In this case, the specific time is when the speaker's father comes home.

2. Auxiliary Verb "Will": The auxiliary verb "will" is used to indicate the future tense.

3. Present Participle Form of the Verb "Watch": The present participle form of the verb "watch" is "watching."

4. The Helping Verb "Have": The helping verb "have" is used to form the future perfect tense.

5. Passive Voice: The sentence is in the passive voice, which means that the subject of the sentence is the receiver of the action, rather than the doer of the action.

6. Duration of the Action: The sentence indicates that the action of watching TV will continue for five hours before the speaker's father comes home.

In summary, "will have been watching" is the correct answer because it uses the future perfect tense, the present participle form of the verb "watch," and the helping verb "have" to indicate that Jack will continue to watch TV for five hours until the speaker's father comes home.