Step 1: Context.
This line refers to the prisoner's endurance and silence in *The Bet*. It highlights his determination not to break the wager.
Step 2: Option Analysis.
(A) The Bet: Correct — The story revolves around the lawyer's long imprisonment.
(B) Allergy: Incorrect — Different theme, not about imprisonment.
(C) Quality: Incorrect — About shoemakers' craftsmanship.
(D) Sun and Moon: Incorrect — Different literary context.
Step 3: Conclusion.
The correct answer is The Bet.