What should be done instead of keeping the wrist very stiff while shading?

Correct answer: Keep the hand relaxed and controlled

Good shading depends on a relaxed but controlled hand and wrist. This allows the pencil to move smoothly, distributes pressure more evenly, and supports flowing strokes, so option A is correct. A stiff wrist can produce broken, scratchy, or uneven marks. Repeatedly lifting the pencil interrupts the tone, folding the paper damages the working surface, and pressing with one finger gives poor control and excessive pressure. Begin lightly, then build darker values gradually where the form requires them.