What are colours placed opposite each other on the colour wheel called?

Complementary colours

The correct answer is C: colours placed opposite each other on the colour wheel are called complementary colours. A colour wheel arranges hues in a circular order. When two hues lie directly across from one another, they form a complementary pair, such as red and green or blue and orange in a traditional colour-wheel description. C is correct because “opposite” is the defining relationship. A is incorrect because analogous colours are next to or near one another on the wheel, not opposite. B is incorrect because neutral colours such as black, white, and grey are not defined by an opposite-wheel position. D is incorrect because a monochromatic scheme uses one hue and its lighter or darker variations. Complementary colours can create strong visual contrast when placed together, although their exact appearance depends on context and medium. Memory cue: complementary colours complete the circle across from one another.

This is a Class 10 Art Education question. Chapter: Fundamentals of Visual Arts. Topic: Colour.