Answer:
А. to show how immature George was in school
Explanation:
According to Stealing The Day by Samantha G, the story is narrated of a smart kid who excelled in every class until he finally met his match.
From the narration, there is a face-off between the two boys, and the new smart kid, George shows his immaturity by telling the other kid that he would excel above him everywhere. He also showed his immaturity during the science fair by reminding him what he said before.
Therefore, the statement that best explains why the author chooses to include a flashback in this passage is to show how immature George was in school.
