Which sentence from the story best supports the idea that Easton has committed a serious crime?

A. "'All marshals handcuff themselves to their prisoners to keep them from getting away.'"

B. "'But you must go on to Leavenworth, I suppose?'"

C. "'It's seven years for counterfeiting.'"

D. "'My dear Miss Fairchild,' said Easton, calmly, 'I had to do something.'"