If the light source is on the left, where will the shadow side usually be on a sphere?

The right side will be darker

The governing concept is light direction and the resulting light-shadow relationship. If the light source is placed on the left, the left-facing part of the sphere receives more direct illumination and is usually brighter. The surface turns away from that source toward the right, where the value generally becomes darker and may develop the core shadow; a cast shadow may also fall to the opposite side on the supporting surface. Therefore, option B is correct. Option A identifies the illuminated side rather than the shadow side. Option C ignores directional lighting, and option D confuses the drawn object with the limits of the paper. Actual softness and reflected light can modify the transition, but not the basic directional principle.

This is a Class 9 Art Education question. Chapter: Elements of Art. Topic: Form.