Which acrylic mixture is suitable for making a maroon-like colour?

Correct answer: A tiny amount of blue or black in red

The governing concept is darkening a dominant hue with a small quantity of another pigment. Maroon is a deep, red-based colour; adding a tiny amount of blue can cool and deepen red, while a tiny amount of black can darken it. Thus option D is the most suitable answer. White in blue makes light blue, yellow in green makes a yellow-green, and orange in yellow keeps the mixture in the yellow-orange family. Add dark pigment slowly.