Which method is most effective for creating visual balance in a painting dominated by warm colours?

Correct answer: Adding a suitable cool colour in a limited area

The governing concept is warm–cool colour balance. When a composition is dominated by reds, oranges, or yellows, a carefully controlled cool accent such as blue, blue-green, or violet introduces temperature contrast and prevents visual heaviness. Option A is correct because the accent is limited, so it balances rather than competes with the main subject. Adding more red, making everything orange, or increasing only yellow intensifies the imbalance.