This is a really good start used good wording, but recheck over punctuation
Answer:
I'm pretty sure the answer would be sentence number 8
Explanation:
This is the start of a new paragraph, and it uses the pronoun "they" for Noel and his friend. The reader might forget who "they" is by this point. In the next sentence the author uses "they" again. It's not exactly precise to use they twice in a row like that because again, the reader might forget who they is referring to. Sentence 8 should say Hami and Noel, instead of they, and then it would be perfectly fine to use they in the next sentence.
Hope that helps :)
Answer:
The argument began in the canteen during breaktime. The people involved were 2 girls named Quinn and Erin. They were fighting about Erin who was accused of jumping the line.