Maybe put it in parenthesis or maybe wait until the next paragraph. I'm not sure it all depends on your teacher.
Answer: Briony begins to see reality.
Explanation:
Briony wants to say she was introduced to real life. That the wrong "understanding" was an idea aimed at a deluded vision, nobody lives in a fairy tale and she had this "weak" idea because she was being awakened to reality through the observation of her own daily life and the people around her .
"High school seniors" is a noun phrase that makes up the subject of the sentence. The simple subject is seniors and the compound adjective high school describes the type of seniors. "Will love" is the verb phrase. Love is an action verb because it is something you can do. Will is a helping verb that helps put love into the future tense. "The theater" is a direct object. It tells what the high school seniors will love. Direct objects receive the action from the subject.
