The kind of conflict the lawyer faces in order to uphold his end of the bet is internal, as he changes his views on money and human nature, as explained below.
We call conflict the struggle or fight between opposing forces. In literature, conflict is what makes the story happen, what motivates the characters and events. We have an external conflict when the character faces an outside force, such as another character. We have in internal conflict when the character has to face his own feelings, ideas, or values.
In the short story "The Bet," a lawyer is challenged to stay 15 years in captivity. The kind of conflict he faces to uphold his end of the bet is internal. As he spends those years studying, he ends up changing his views. He now despises human nature and money, so there is no reason for him to keep on going with the bet.
With the information above in mind, we can choose the second answer choice as the correct answer.
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