what is a half pipe?\na maneuver in downhill skateboarding\na u - shaped ramp\na straight ramp

what is a half pipe?\na maneuver in downhill skateboarding\na u - shaped ramp\na straight ramp
Answer
Brief Explanations:
A half - pipe is a well - known structure in extreme sports like snowboarding, skateboarding etc. It is characterized by its u - shaped form which allows athletes to perform tricks as they move from one side to the other. It is not a maneuver or a straight ramp.
Answer:
B. A u - shaped ramp