Final answer:
The significant event in the excerpt is Jamie realizing that Margaret is her true best friend, as represented by option B.
Step-by-step explanation:
The significant event described in the excerpt from "I'm Not" involves a moment of realization for Jamie about who her true friends are. During a soccer game, Jamie is knocked down, and it is Margaret's reaction and actions that highlight her as Jamie's best friend.
Despite the physical fall, the emotional revelation stands out as Jamie is helped back up by Margaret, who scolds Richard for his behavior and expresses her loyalty, marking the beginning of their lasting friendship. This turning point is significant because it reinforces the value of friendship, loyalty, and support during times of adversity.
Given the options provided: A, Richard knocks Jamie over during a game of soccer; B, Jamie learns that Margaret is her best friend; C, Margaret kneels down next to Jamie; D, Jamie squints and sees Margaret standing above her—the correct option that represents the significant event in this excerpt is B, Jamie learns that Margaret is her best friend.