Why is an outer circle alone not enough to make a ball look real?

Correct answer: Because value and shadow create volume

The correct answer is A: value and shadow create the impression of volume. An outer circle gives the ball a two-dimensional boundary, so it tells us the shape of the object on the page. To make that circle look like a round solid ball, the artist must show how light falls across its surface. Gradual changes from light to middle value and darker shadow help the viewer understand curvature and three-dimensional form. A cast shadow may also show where the ball rests, but the essential point in this question is that value and shading turn a flat outline into an impression of volume. B is wrong because a circle is the correct basic shape for a front view of a ball. C is wrong because colour can be useful, although colour alone is not the main requirement for volume. D is wrong because a line can clearly create a boundary. Memory cue: outline tells “what shape”; shading tells “what form.” Do not confuse the drawn boundary with the modelling of the surface.