Which combination is most important in the final evaluation of effective pencil shading?

Correct answer: Correct light direction, balanced values, and controlled edges

Effective pencil shading depends on three connected checks: the light must come consistently from one direction, the values must progress from light to dark in a believable way, and edges must be sharp or soft according to the form and light. Thick outlines alone can flatten a drawing, equal blending removes variation, and texture cannot replace shadows. Thus A is the complete combination.