What effect is created by making colour lighter from the centre toward the edge of a flower petal?

Correct answer: The petal shows softness and form

The governing concept is tonal gradation used to suggest form. When the colour becomes lighter from the centre toward the edge, the gradual value change indicates a curved, delicate surface and gives the petal softness and volume. Therefore option B is correct. A single uniform tone is more likely to make a petal look flat; the process does not cut the paper or make the colour disappear. The transition should be blended gently without a hard boundary.