The correct answer is C: He is able to show the banker's worries about his possible defeat by the lawyer.
The tale is told using the third person limited point of view. This means that we have a narrator that is external to the action of the story, but who follows it from the perspective of one of the characters alone.
The use of the third-person limited point of view allows Chekhov to share with the readers the banker's reasons for wishing to kill the lawyer.
