Explanation:
The correct option is 'c'. Anterior-Posterior Compression (APC) Type III injuries involve complete disruption of both the anterior ring (symphysis diastasis) and the posterior ring (complete disruption of anterior and posterior sacroiliac ligaments). This creates a highly unstable "open book" pelvis, drastically increasing the pelvic volume and resulting in the highest risk of massive retroperitoneal hemorrhage from the posterior venous plexus and branches of the internal iliac artery.

Reference: Young JW, Burgess AR, Brumback RJ, Poka A. Pelvic fractures: value of plain radiography in early assessment and management. Radiology. 1986;160(2):445-451.