Which mixture can create a cream-like colour?

Correct answer: By adding a little yellow to white

The governing concept is tinting a light base colour. White provides a high-value, light foundation, and adding a small amount of yellow warms it and produces a soft cream-like appearance. Therefore option A is correct. Blue added to black remains very dark, red mixed with green becomes muted, and black added to violet makes it darker rather than cream. The exact appearance depends on the proportions and pigments used.