Explanation
Correct answer: B.
Choice B is the best answer because it most accurately describes the main purpose of the text. The text describes how the narrator watches people working out at a gym through a window near a bus stop. The narrator says that "there ain’t nothing funnier" than watching people try to work out on the stair climber machine. Thus, the main purpose of the text is to describe an activity that the narrator finds amusing.
Why the other choices are wrong
Choice A
Choice A is incorrect because the text isn’t about the narrator beginning middle school. The text describes how the narrator finds people working out at a gym amusing and makes no mention of school life.
Choice C
Choice C is incorrect because the text doesn’t mention any problems that the narrator currently has or has overcome. It just describes how the narrator finds watching people work out amusing.
Choice D
Choice D is incorrect because the narrator invents the made-up movie mentioned in the text. The text doesn’t indicate that the narrator has seen a movie in a theater. The focus of the text is on the narrator watching people at the gym, not watching a movie.