Answer: c. The lawyer’s diction becomes gloomier.
In "The Bet," Chekhov tells the story of a banker and a lawyer who make a bet. The bet is about whether the death penalty is worse or better than life in prison. In order to show how the lawyer's outlook in life changes throughout the story, Chekhov uses language. As the story progresses, the lawyer's speech becomes gloomier as he becomes more and more desperate.