What problem can occur if midtones are removed and only highlight and dark shadow remain in a form?

Transition on curved surfaces will look harsh

The governing concept is tonal transition: midtones connect the light-facing planes to the shadow-facing planes. On a curved form such as a sphere, the surface turns gradually, so its values should normally change gradually as well. If the middle range is removed, the eye sees an abrupt jump from bright highlight to very dark shadow. That sharp break can make the curve look angular, cut, or artificially outlined instead of smoothly rounded. A strong highlight and shadow may be useful for emphasis, but they cannot replace the transitional values needed for believable modelling. Thus option A is correct; the other choices incorrectly claim that removing midtones automatically improves naturalness, smoothness, or volume.

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