Which of the following best explains the difference between an absolute monarchy and an oligarchy? a. an oligarchy is ruled by an elite group; an absolute monarchy is ruled by a single individual. b. an oligarchy allows for freedom of religion; a monarchy gives power to members of a church. c. an empire that rules over multiple kingdoms is an oligarchy; each kingdom is a monarchy. d. an oligarch is a single individual who wields power; a monarchy is ruled by an elite group.