Explanation:
The correct option is 'b'. A Salter-Harris Type II fracture is the most common physeal injury. The fracture line passes through the hypertrophic zone of the physis and then abruptly veers into the metaphysis. The resulting triangular piece of metaphyseal bone that remains attached to the epiphyseal fragment is known as the Thurston-Holland sign.

Reference: Salter RB, Harris WR. Injuries Involving the Epiphyseal Plate. J Bone Joint Surg Am. 1963;45(3):587-622.