How is the title 2br02b relevant to the story?

"2 B R 0 2 B"  was a story by Kurt Vonnegut, published in 1962. The title of the story "2 B R 0 2 B " was taken from the famous phrase "to be, or not to be“ from Hamlet, by  William Shakespeare. In this short story, the title 2BR02B was a telephone number which will allow a character of the story to make an appointment to commit suicide if he is tired of living.

Rebuttal is when you are giving evidence against the original proposal. Having this in mind, the sentence that contains a rebuttal is sentence 3.
As you can see there, it is the only sentence that talks about negative effects of sports, whereas the rest of them only show its positive sides.