The Question and Answer section for The Bet is a great resource to ask questions, find answers, and discuss the novel.
I think it goes like this:
he played the piano as he suffered from loneliness and boredom
he requested only classic literature
he intensively studied languages, philosiphy, and history
he read only the new testement
What is the answer to part A?
The lawyer openly challenges the banker's argument who is for capital punishment and believes that it is more merciful than prison.