Why is there a main difference between the shading style of a cube and a sphere?

Correct answer: Because a cube has flat faces and a sphere has a curved surface

Correct answer: A. Shading describes changes from light to dark that help show an object’s form. A cube is made of separate flat faces meeting at clear edges. Depending on the light, one face may be bright, another middle-valued, and another dark, with fairly clear changes between planes. A sphere has one continuous curved surface, so its value usually changes gradually across the curve from light toward dark. A is correct because surface geometry controls the shading pattern. B is false because a cube can be any colour. C is false because a sphere can receive light and cast or receive shadows. D is incomplete: both may be drawn as shapes, but their three-dimensional forms differ. Memory cue: flat faces give clearer value steps; a curved surface gives a smoother transition.