What control is most necessary for a good result in a monochromatic scheme?

Correct answer: Keeping a wide range of values

Direct answer: C, keeping a wide range of values. A monochromatic scheme is based mainly on one hue or colour family, so variety cannot come from using many unrelated colours. To prevent the work from looking flat or dull, the artist controls light and dark values within that colour family. A wide, well-organised range can separate objects, show highlights and shadows, create depth, and establish emphasis while preserving colour unity. A is incorrect because paper size may affect the layout but is not the key control in a monochromatic colour scheme. B is incorrect because adding many colours would move away from the central monochromatic idea. D is incorrect because removing all figures is a compositional choice, not a necessary colour control. The range should still be balanced; random extremes can weaken harmony. Memory cue: one hue, many values—use light, middle, and dark versions to create interest.