Question

What is the definition of a tone?

A: Any color plus black
B: A good sound
C: Any colors plus gray
D: Any colors plus white ​

Answer 1

In painting, tone refers to the relative lightness or darkness of a colour. So basically C

Answer 2

Tone is a hue or mixture of pure colors to which only pure gray is added (equal amounts of black and white). Adding gray to a color will make the intensity much duller.