Explanation:
The correct option is 'c'. A 'spilled teacup' sign on a lateral wrist radiograph indicates a lunate dislocation. The lunate loses its normal articulation with both the radius and the capitate, rotating volarly so that its concave distal articular surface faces anteriorly (spilling the tea). In a perilunate dislocation, the lunate remains seated in the radial fossa, but the capitate is dislocated dorsally.

Reference: Herzko RS. Anatomy and biomechanics of the carpus. Hand Clin. 1997;13(1):1-14.