Which quality may be reduced if all tones are blended completely smooth?

Correct answer: Clarity of texture and planes

The governing concept is selective blending. Smooth transitions are useful for rounded forms, but blending every area equally can erase directional strokes, surface marks, and boundaries between planes. As a result, texture and the structure of angular surfaces become less readable. Option B is correct. Blending cannot change the paper’s thickness, the object’s actual height, or the physical length of the pencil; those distractors confuse drawing appearance with material facts.