Which relationship should be checked first while sketching a seated human figure?

Correct answer: The direction of the torso, thighs, and legs

A seated figure is understood first through its large directional relationships: the tilt of the torso and the directions of the thighs and legs. Checking these major masses establishes balance, weight, and pose before small details are attempted. Thus, option A is correct. Hair strands, clothing decoration, and a facial shadow may be added later, but they cannot establish the overall seated structure.