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

a.) "'you're not jimmy wells,' he snapped."

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

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

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