When adults toss balls to very young children they generally try to

To correctly answer this question, we need a choice that answers the following question:

WHY would children have an easier time catching balls that are thrown at faster speeds than balls thrown at a slower speeds?

(A) Correct. This could explain why they do. The children are somehow triggered by fast moving balls, a factor that somehow helps them to quickly react and catch the balls.

(B) Incorrect. This does not tell us why children would more easily catch faster moving balls. In fact, it gives us a reason to believe that they would more easily catch slower moving balls.

(C) Incorrect. We have to be careful not to concoct a story from what this choice says, arriving as something like. "This shows that children are different from adults. So, they don't catch the same way, and therefore catch faster moving balls better." This choice provides no information that explains why a child more easily catches a faster moving ball.

(D) Incorrect. The fact that children do better when they throw faster does not explain why they more easily catch faster moving balls. While this answer is not particularly tricky, it does illustrate the fact that a choice that mentions something, in this case faster moving balls, that is related to what we are looking for is not necessarily correct, and could be a trap.

(E) Incorrect. The fact that there is a limit to how fast the balls can be tossed to the children does not explain why they more easily catch faster moving balls.

The correct answer is A.