How many main colours are used in a monochromatic scheme?

Correct answer: One

The direct answer is A, one main colour. Monochromatic comes from words meaning one and colour. In art, a monochromatic colour scheme is built from one colour family, with lighter, darker, or less intense versions of that same colour. Step by step: choose one base colour, such as blue; add white to make lighter tints or black to make darker shades, or vary its intensity; use those related versions together; the picture gets unity without changing to a different basic hue. Option A is correct because the scheme has one main colour family. Option B, two colours, describes a two-colour scheme, not monochromatic. Option C, three colours, is a multicolour or possibly a special three-colour scheme, but it is not monochromatic. Option D, four colours, is also a multicolour arrangement. The word does not mean only one paint mark or only one exact tone; it means one dominant hue with its variations. Memory cue: mono means one, so monochromatic means one colour family.