The first option- He started earning A's, became a top athlete, and was accepted to Harvard.
Explanation:
He explains how his whole life up until high school he was failing classes and struggling in school. He supports his statement "Well, in high school something changed. I acquired some study skills, my mindset changed." with the fact that he started to get straight A's and he soon got accepted into Harvard.
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It demonstrates that Nora is considering leaving her children.
The text states: Nora: Do you think they would forget their mother if she went away altogether? This implies that Nora is thinking about a scenario where she leaves her children behind. Hope I helped!