A yellow-to-violet transition in a sunset is becoming muddy. Which strategy will preserve colour purity?

Correct answer: Use controlled intermediate colours such as red or orange

The governing concept is controlled colour transition. Yellow and violet are complementary, so mixing them heavily in one wet area can neutralise their chroma and produce mud. Intermediate hues such as orange, red and magenta create a staged path between the endpoints, reducing uncontrolled complementary mixing while preserving luminosity. Black dulls both colours, white weakens the sky, and direct heavy mixing worsens the problem. Therefore B is correct.