Which term is more suitable when a colour is muted by adding grey?

Correct answer: Tone

Correct answer: C, tone. A colour becomes a tone when grey is added to it. The grey reduces the colour’s intensity or saturation, so the result looks softer, duller, or more muted while still belonging to the same general colour family. A is wrong because a tint is made by adding white, producing a lighter version of the colour. B is wrong because a shade is commonly made by adding black, producing a darker version. D is wrong because form means a three-dimensional appearance or structure, not a way of modifying colour intensity. The wording ‘muted by adding grey’ is the important clue. In practical painting, the exact visual result also depends on the amount and character of the grey, but the standard school-art term remains tone. Memory cue: white makes tint, black makes shade, grey makes tone.