<u>at this point, he now understands mentally that propaganda had all along been used on him.</u>
Explanation:
<em>Recall, </em>in the story after Montag kills Captain Beatty, he felt unsafe and decided to flee to Faber. When he got to the house of Faber they began watching TV, then he saw the efforts underway to find him, which made him begin to imagine he has captured on television.
After seeing the propaganda about his search on television, he now understands mentally that propaganda had all along been used on him.
A because "Because she was too young" can't stand by itself. To test if it is dependent, see if it makes sense by itself. if it does, it is independent.
