How can an artist preserve a sense of volume while stylising a form?

Correct answer: By retaining the basic structure and useful light-dark relationships

Stylisation can simplify details without removing the cues that make a form look solid. Retaining its basic structure, surface direction, and helpful light-dark relationships lets viewers read which parts turn, project, or recede. Thus option A is correct; removing all shadows or flattening the form would generally weaken its sense of volume.