Which sentence from the text of "the bet" best expresses the banker's development in the story? "to avoid arousing unnecessary talk, he took from the table the writing in which the millions were renounced, and when he got home locked it up in the fireproof safe." "'if i had the pluck to carry out my intention,' thought the old man, 'suspicion would fall first upon the watchman.'" "'the thought that you have the right to step out in liberty at any moment will poison your whole existence in prison. i am sorry for you.'" "the slightest attempt on his part to break the conditions, if only two minutes before the end, released the banker from the obligation to pay him the two millions."