Annie is sledding down a snow-covered hill. She knows that the steeper the hill, the faster her sled will go.A. The amount of snow is a function of the speed of the sled.B. The speed of the sled is a function of the amount of snow.C. The speed of the sled is a function of the steepness of the hill.D. The steepness of the hill is a function of the speed of the sled.