What is the correct meaning of making a tone?

Correct answer: Adding grey to a colour to reduce its intensity

Direct answer: C, adding grey to a colour to reduce its intensity. A tone is generally made by mixing grey with a colour. The result is less vivid or more muted, so the colour appears softer and less strongly saturated. This is different from changing only its lightness or darkness. A is incorrect because adding white creates a tint, which is a lighter version of the colour. B is incorrect because adding black creates a shade, which is a darker version. D is incorrect because erasing changes or removes the mark on the paper; it does not create a colour-theory tone. For a simple classroom memory cue, remember the three common terms together: white plus colour gives tint, black plus colour gives shade, and grey plus colour gives tone. The exact visual result can depend on the materials, but this basic terminology is the intended distinction.