Which exercise will show how different amounts of white change the value of the same red colour?

Correct answer: Create gradual red tints using measured amounts of white

The governing concept is a value scale or tint series. To isolate the effect of white, keep the red pigment constant and add measured, increasing amounts of white to separate samples. Arrange the samples from the original dark red toward the lightest tint and compare their lightness. Option C is correct because only the white proportion changes systematically; complementary mixing or changing every hue would test other properties.