Answer:
Because of what it expresses
Explanation:
I'm not the smartest hope it helps
I would say that the example of satire among these options is d. Those two old brothers had been having a pretty hot argument a couple of days before, and had ended by agreeing to decide it by a bet, which is the English way of settling everything.
Twain is criticizing and mocking the English for settling everything in such a trivial manner as betting.