Which process can create several lighter versions of the same colour?

Correct answer: Gradually increasing the amount of white

The governing concept is the creation of tints and shades. When white is added to a base colour in increasing proportions, the result becomes progressively lighter; each mixture is a tint of that colour. Therefore, option A is correct. Adding black would create progressively darker shades. Mixing all primary colours often produces a dark, dull neutral, while equal complementary colours also tend toward a neutral brown or grey instead of several lighter versions. The white should be added gradually for controlled steps.