What is an effective way to emphasize a small orange area in a poster?

Correct answer: Place it near a blue area

The governing design principle is contrast, especially complementary colour contrast. Blue and orange are opposite or complementary hues on the colour wheel, so placing a small orange shape beside a blue area makes their difference noticeable and increases the orange shape’s visual emphasis. An identical orange background removes contrast, adding water changes paint strength rather than composition, and muting every colour equally does not create a focal point. Thus, option A is correct.