If a large amount of white is being used to lighten a dark poster colour what is the more controlled method?

Correct answer: Add the dark colour gradually into a white base

The governing mixing principle is to control a strong pigment by adding it gradually to a lighter base. A small quantity of dark colour can noticeably change white, so option D allows the tint to be adjusted step by step and avoids wasting white paint. Adding more white at once reduces control, black makes the mixture darker, and extra water changes opacity rather than producing a controlled light tint.