My best guess would be A. B is the second best answer. C and D don't seem to be very good answers. How many attempts do you have at this question?
Twain likely made Henry Adams an American in England to show how far removed he was from what was viewed as proper English society. As an American he would be considered a backwards outsider that could not possibly fit in. That all changes when he receives the bank-note and then can afford to buy his way into the English society.
So basically the answer is true
It has to be B, he is stuck in the past
