There are a lot of synonyms for discussion like: argument, conference, controversy, conversation, debate, dialogue, dispute, and quarrel for example.
You would want to use B. sentimental here because it's defined as nostalgia or a feeling of tenderness or sadness for something, which in this case would be all of the memories that Jeremiah had in high school.
C. We should bring: note cards, paper, and books to class.
rules for colons - used for a list of items (as displayed in answer C), a quotation (Not to get confused with quotation marks) or an expansion of an exclamation
What are the choices to fill the blank
They talk to each other because they are separated by a brick wall which has a small crack in it. But the crack is big enough for them to whisper through