How will a red and yellow mixture appear if red is used in greater quantity?

Correct answer: Red-orange

Red and yellow are mixed to form orange, which is a secondary colour. The governing idea is colour bias: when one component is present in a greater amount, the resulting mixture appears closer to that component. Since red is used more than yellow, the orange shifts toward red and becomes red-orange. Hence option A is correct; yellow-orange would require more yellow, while the other choices involve different hue relationships.