The distance that is not a wavelength in the image is C to E.
Wavelength is the distance between two successive crests or two successive trough or crest to trough.
It is also the distance over which the wave's shape repeats.
Based on the image, the following are wavelengths;
Thus, the distance that is not a wavelength in the image is C to E.
Learn more about wavelength here: https://brainly.com/question/10728818