Why does gradual value change appear more harmonious than sudden value contrast?

Correct answer: It provides a smooth transition between light and dark values

In art, value means the relative lightness or darkness of a colour or tone. Gradation changes value through intermediate steps, so the eye moves continuously from light to dark instead of encountering an abrupt visual jump. Option D is correct because this smooth transition supports unity and harmony. It does not make shapes equal, remove texture, or automatically create complementary colours.