Missouri Board of Cosmetology Practice Exam

A finger wave is a popular hairstyle from the 1920s that involves creating "waves" in the hair by shaping it with your fingers. The peak of a finger wave is the highest point of the wave, also known as the ridge. The trough, crest, and wavelet are all terms used to describe different parts of a wave, but they do not pertain specifically to a finger wave. Therefore, A is the best answer.