Answer: D. the nature of people to blame others for their own mistakes or shortcomings.
Explanation: A satire is a technique in writing used to criticize any aspect of society, employing humor, exaggeration or irony. In the given excerpt from "The £1,000,000 Bank-Note" by Mark Twain, we can see an example of satire in order to criticize how people blame others for their own mistakes, this is shown in the tramp's fear to go to the bank, because he thought that they would blame him for the mistake they made.