The plot is about how middle schoolers evolve. The setting of the school shows the everyday life of the main middle schooler going through the struggles of being a preteen and the preparation for high school. (If this doesn’t help google the plot of the story and think about the setting and the the relation.)
The Central Theme is what the story is basically about.
your welcome
BABY SHARK DO DO DO DO
B.B is the correct answer because of the grammar.