Unlike the sport of skiing, snowboarding does not involve the use of poles. In skiing, the skier’s feet are strapped to separate skis, and he or she can change direction using the poles. In snowboarding, on the other hand, the feet are strapped to a single board of fiberglass or wood. The snowboarder must steer by leaning in the direction he or she wants to go, as a skateboarder does. Whereas most skiers compete by racing against each other on different courses, most snowboarders compete with freestyle tricks or great feats of acrobatics.
How is this passage organized?
A. chronological order
B. cause and effect
C. description
D. compare and contrast