Explain how the colors of the visible light spectrum are organized using the terms wavelength and frequency.

The explanation regarding the colors of the visible light spectrum is to be explained below:

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Visible light spectrum is a part of electromagnetic waves.  The colors of the visible light spectrum are organised on the basis of their wavelength and frequency.

As the light or color having high frequency will have the shorter wavelength and vice versa, so  colors in visible light spectrum arranged from highest frequency to lowest frequency or from shortest wavelength to highest wavelength. For example: The highest frequency color is violet and lowest frequency of visible light is red.

the answer is definitely c.