Question

8:23 am. \so, uh, hello. im reggie—reginald garvey mcknight, and im running for president.... thank you.... a couple weeks ago i got up on a table in the cafeteria, and, uh, and made my big announcement. and it felt pretty good, standing up there and being the center of attention. \but, um, there are times when being the center of attention hasnt felt so good. yeah, i guess you remember.... see, i thought that youd never forget it, and it looks like i was right.... i realize that the thing is, i was the one who couldnt let it go, the whole...pukey thing. yeah, i said it. i let it define based on the underlined sentence, what important discovery has reggie made? his classmates liked him more than justin. he was sad about being the center of attention. his own attitude was holding him back. he could finally appreciate his silly nickname.

Explanation:

The underlined text shows Reggie acknowledges he was unable to move past a negative event (the "Pukey thing") and let it define him, meaning his own mindset/attitude was holding him back from moving forward. The other options are not supported by the underlined sentence: there is no mention of classmates preferring him over Justin, sadness about attention, or appreciation for his nickname.

Answer:

His own attitude was holding him back.