What effect occurs if the core shadow of a sphere is made uniformly black up to the outer contour?

Correct answer: The shadow will appear harsh and the volume less natural

The governing concept is the modelling of a sphere through gradual value changes. A sphere normally shows a core shadow, some reflected light, and a softer change toward the contour. Making the entire shadow side uniformly black removes that variation, creates a harsh, flat-looking mass, and weakens the sense of round volume. Therefore option D is correct. It cannot make the object lighter, soften the cast shadow, or enlarge the highlight.