Which colour adjustment is useful for making orange look natural in a sunset?

Correct answer: Create several oranges by varying red and yellow proportions

The governing concept is controlled colour mixing and variation. Orange is produced from red and yellow, but a real sunset contains changes in hue, value and saturation. Varying the proportion of red and yellow creates warmer, yellower or redder oranges and prevents a flat, repeated appearance. Option A is correct; equal black dulls every mixture, one pure orange lacks variety, and green does not represent the sunset’s dominant colour family.