Which excerpt from the passage best contributes to the amusing tone? a. he stretched himself, and told his valet to give him a little mirror which was on the table. b. then he sprang out of bed, and shook himself violently! no, no nose any more! c. he dressed himself and went at once to the police superintendent. d. kovaloff, the member of the municipal committee, awoke fairly early that morning . .

I would say the correct answer is B. Then he sprang out of bed, and shook himself violently! No, no nose any more!
This sentence differs from the other ones that you've given us because it seems more active, more lively. There is something actually happening here, and the exclamation marks show that it is happening fast. All of these together make the sentence somewhat amusing, at least as opposed to the other ones here.