Acolor that is almost gray has a saturation.

When we see a solid color that is red, blue, or black let's say, it is said to have a high saturation of color. A color that is almost gray has very little or very saturation. Of course, the amount of gray can vary greatly but for the most part a color that is almost gray has little or no saturation at all.

The complete statement is A color that is almost gray has a low chroma saturation

Gray color saturation

Generally, strong colors like red, blue, or black, are said to have high saturation. A color that is almost gray has very little or very saturation.

But as  the amount of gray varies so does the saturation indication too

But in general, most shade a color that is almost gray has little or no saturation.

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The anwser is: wave a has a greater pitch and frequency.