Which of the following sentences from "Snowboarding" BEST supports an understanding of the primary focus of the fourth paragraph of "Peace on the Mountain? A. As you stand on top of a mountain, gravity is exerting its force on you.

B. Your own center of gravity changes your ability to stay upright if you move beyond your base, you will fall.

C. This lubrication actually increases your speed down the mountain as the melted snow reduces friction.

D. If you plow pushing your board through an increased area of snow, creating more friction you will slow down.