Which of Robert's actions in The Number Devil best reveals that the author's purpose is to entertain?

dealing with the tricks his dreams are playing on him
staggering down to the basement in his pajamas
having a conversation with an imaginary number devil
thinking about his friends Al, Betsy, and Charlie

Tobias wolff most likely named his short story "mortals" because the story explores the theme of people coming to terms with the idea that one day they too will die. wanting to find out what their loved ones really think of them. achieving immortalit by being "big people" while they are alive. hoping that they will have accomplished something before they die.