B solemn I think is the correct answer
You have to ask him if he remembers you first
Answer:
interwoven means strung together usually by situational circumstances
Depending on the subject, he could go to his text book, online ebook, etc. He could look at his review if he was given one. He could find other books relating to the subject that could potentially help. (Not much to go on, hope this helps c:)
Readers learn the narrators own analysis and explanation for his behavior