Answer:
A pronoun.
Explanation:
A pronoun takes the place of one or more nouns.
I believe none of these options are correct. However, if you had to choose one, I would pick A - <span>Nina slid into her seat just as the bell rang and tried to catch her breath.
B, C, and D are incorrect because these are all examples of direct characterization, meaning that the other directly tells us what these people are like. This doesn't happen in A, which is why I would choose that option.
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C because all of Shakespeares writing at least within romeo and juliet alone was iambic pentameter if you look how it is written you can see it follows that same standard.
