Answer:
A. It explains the origin of people, animals, and plants.
Step-by-step explanation:
The Iroquois myth "The World on Turtle's Back" is a myth about the creation of everything in the world by two brothers.
The provided passage talks of when the two brothers first started making these creatures as a form of making toys for playing. With their creative powers, they were able to bring forth real creatures or beings from whatever was made. And the competition to make better and more powerful being from the previous led to the creation of man. The mention of the right handed boy's creation of man in the end also is suggestive of the creation story. The whole passage talks of the twin brothers' creation of all animals and eventually man.