Answer: b. his mother and sister kill him in order to rob him.
Explanation: In "The Stranger" by Albert Camus what happens to the man in the story within the story is that his mother and sister kill him in order to rob him. While in prison Meursault finds a scrap of newspaper with a story. It is about a Czechoslovakian man who leaves his town being very young. He becomes rich and comes back in disguise to the town hotel which is ruled by her mother and sister. He shows his money to them and they kill him in order to rob him.