What is the importance of repeating the same light direction in a group of forms?

It makes the group believable as part of the same environment

A group of forms appears to occupy one believable environment when the lighting behaves consistently across the whole group. If the light comes from the upper left, for example, the brighter planes, darker planes, and cast shadows should generally respond to that direction on every object. Repeating the light direction does not mean that every object has identical shading, because size, surface angle, and material can change the result. It means that the cause of the illumination remains coherent. Option A is correct because consistent light unifies the forms in space. B suggests contradictory sources, C is false because consistent light still creates shadows, and D describes a possible problem rather than the purpose.

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