Final answer:
At a football game, "the wave" performed by the crowd is an example of a transverse wave, where the motion of the crowd is perpendicular to the direction of the wave's travel. Therefore, the correct answer is Option C.
Step-by-step explanation:
The wave observed during the football game, where the crowd stands up and raises their hands as the wave is passed around the seats, is an example of a transverse wave.
A transverse wave is a type of wave in which the disturbance (or oscillation) of the medium is perpendicular to the direction of wave propagation. In this case, the medium (the crowd) oscillates up and down while the wave propagates around the stadium horizontally.
Other examples of transverse waves include waves on the strings of musical instruments and electromagnetic waves, such as visible light.