Which text from "after twenty years" provides the best evidence that “silky bob” is surprised that his friend is now a policeman?

a."his hand was steady when he began to read, but it trembled a little by the time he had finished."

b."'you're not jimmy wells,' he snapped."

c.'is that you, bob? ’ he asked, doubtfully."

d."'you’ve changed lots, jimmy. i never thought you were so tall by two or three inches.'"

Among the choices, the text from "After Twenty Years" that best provides evidence that "Silky Bob" was surprised that his friend is now a policeman is A. "His hand was steady when he began to read, but it trembled a little by the time he had finished."

Two best friends, Bob and Jimmy, twenty years ago, have agreed to meet in front of a hardware store at exactly 10 pm. Bob was waiting for his friend Jimmy when a policeman approached him and asked what he was doing there. The policeman afterwards left. A man who introduced himself as Jimmy then approached Bob. However, while walking down the street, as light hit the other man's face, Bob realized that it wasn't his friend. The man then told him he was arrested and handed him a note. It was then that Bob realized that the policeman earlier was his friend Jimmy. Jimmy was unable to arrest his friend so instead, he asked a bystander to confront Bob. 

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