In paragraph 3, why does the author include a description of a painting of horses from the grotto of Pêche Merle? A. To emphasize that stout-bellied horses were the most commonly found animals in that region at the time the painting was made B. To provide evidence that Paleolithic artists created realistic images more often than they created paintings of dots or lines C. To give an example of a cave painting that contains elements that do not imitate reality D. To demonstrate that Paleolithic artists captured many details of the animals they painted, such as the spots on the horses' coats