What identifies effective medium-level pencil shading?

Correct answer: Controlled pressure, clear value order, form-following strokes, and suitable edge variation

Effective intermediate pencil shading depends on control rather than simply making the drawing dark. The artist varies pressure to create an ordered scale from light to dark, directs strokes around the form, and uses both soft and firm edges where appropriate. Therefore option B is correct. A single black value lacks modelling; uniform blending removes material and form differences; and a thick contour cannot create convincing volume by itself.