Which mixture is useful for making olive green acrylic colour?

Correct answer: Add a little yellow and very little black to green

The governing concept is controlled mixing of hue, value, and saturation. Starting with green, a small amount of yellow warms it, while a very small amount of black lowers its brightness and helps create an earthy olive tone. Therefore, option C is correct. White would only lighten green, yellow with violet tends to become dull, and red with blue produces a purple or muted dark mixture rather than olive. Test black gradually.