Explanation:
The correct option is 'b'. Posterior hip dislocations are far more common than anterior dislocations, accounting for approximately 90% of all traumatic hip dislocations (often resulting from 'dashboard injuries' in motor vehicle accidents). The classic clinical presentation of a posterior hip dislocation is a limb that is shortened, flexed, adducted, and internally rotated. Anterior dislocations typically present with the limb externally rotated and abducted.

Reference: Epstein HC. Traumatic dislocations of the hip. Clin Orthop Relat Res. 1973;(92):116-142.