If you are looking to reduce saturation, the colors mute and fade. Black and white images contain no saturation, so if you also find it confusing, this is a great place to start from. The saturation levels of an image can be changed by using filters. These reduce the amount of certain wavelengths of light hitting a camera sensor or film.
The answer would be C. Pablo Picasso. "Metaphysical" is another word for "Abstract". Picasso is quite famous for his abstract art. I hoped this had helped you.