Waves Begin to "Feel Bottom" When the Depth of Water

Multiple Choice

Waves begin to "feel bottom" when the depth of water is _______ . It has been likened to "stubbing your toe" and results from the wave not having enough room to be naturally contained within that depth of water.

A) equal to the wavelength
B) three times as great as the wavelength
C) twice as great as the wavelength
D) equal to its wave base