When adults toss balls to very young children they generally try to toss them as slowly as possible to compensate for the children' s developing coordination. But recent studies show that despite their developing coordination, children actually have an easier time catching balls that are thrown at a faster speed. Which one of the following, if true, most helps to explain why very young children find it easier to catch balls that are thrown at a faster speed? ['Children are able to toss balls back to the adults with more accuracy when they throw fast than when they throw the ball back more slowly.', 'Adults generally find it easier to catch balls that are thrown slowly than balls that are thrown at a faster speed.', 'Balls thrown at a faster speed, unlike balls thrown at a slower speed, trigger regions in the brain that control the tracking of objects for self-defense.', 'There is a limit to how fast the balls can be tossed to the children before the children start to have more difficulty in catching them.']