Question

in this sledding sport, 2 or 4 person teams race down a curvy, ice course at a speed of over 120 miles per hour. ice boarding; bobsled; cannonball; ice boats

Explanation:

The description mentions a sledding sport with 2 or 4 - person teams racing down a curvy ice course at over 120 miles per hour. Bobsled is a sledding sport where teams (2 or 4 people) race on ice tracks at high speeds, while Ice Boarding, Cannonball, and Ice Boats do not match this description.

Answer:

B. Bobsled