Which mixture is useful for creating cream with poster colour?

Correct answer: A little yellow added to white

Cream is a very light, warm tint, so the usual method is to use white as the main base and add a small amount of yellow; option A is correct. The white keeps the value high, while yellow supplies a gentle warm cast. The other mixtures involve darkening or complementary-colour mixing and are more likely to create deep, neutral, grey, or muddy results rather than a light cream. Add yellow gradually to avoid over-colouring the white.