The correct answer is C) They teach us about the order of the world.
The singular thread that binds myth, legend, and folklore together is "They teach us about the order of the world."
Most of the stories that refer to the creation, beginning or developing of humankind involved some kind of myth, legend, and folklore. And these components had become a serious part of the history of many nations. If we check the story of the creation of the Sumerians, it is full of these three elements. If we continue with Egypt, it is the same. The Greeks, the Romas, the Hindu people. The Mayas, The Aztecs, the Incas, all of them, all over the world have stories that teach us about the order of the world using myth, legend, and folklore.