Answer:
The amplitude of a wave is most directly related to crest length.
Explanation:
Note: The amplitude of a wave is independent of both wavelength and frequency.
The amplitude or height of a wave (note the word height) is gotten by measuring from the peak to the trough of the wave.
Crest is the height/peak of the amplitude up and down.
Amplitude of the wave is the wave height i.e. height of a crest + height of a trough. This is the same as crest length.
The amplitude of a wave is most directly related to crest length.
