**Core Concept**
The question is testing the association between pelvic fractures and a specific complication. Pelvic fractures are complex injuries that can result in significant morbidity and mortality. The underlying pathophysiology involves disruption of the pelvic ring, leading to potential complications.

**Why the Correct Answer is Right**
The correct answer is associated with the potential for significant blood loss due to the disruption of the pelvic veins. The pelvic veins, particularly the internal iliac veins, are responsible for draining blood from the pelvic organs and muscles. When the pelvic ring is disrupted, these veins can be torn, leading to severe bleeding. This can be exacerbated by the presence of a pelvic hematoma, which can further compromise hemostasis. The correct answer is also associated with the potential for retroperitoneal bleeding, which can be difficult to diagnose and manage.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it is not directly related to the complications of pelvic fractures. While it is true that pelvic fractures can be associated with multiple injuries, this option is too vague and does not specifically address the complication being asked about.

**Option B:** This option is incorrect because it is not a direct consequence of pelvic fractures. While it is true that pelvic fractures can be associated with infections, this is not a direct complication of the fracture itself, but rather a potential secondary complication.

**Option C:** This option is incorrect because it is not a direct complication of pelvic fractures. While it is true that pelvic fractures can be associated with neurological deficits, this is not a direct consequence of the fracture itself, but rather a potential secondary complication.

**Clinical Pearl / High-Yield Fact**
Pelvic fractures are often associated with significant blood loss due to the disruption of the pelvic veins. It is essential to recognize the potential for retroperitoneal bleeding and to have a high index of suspicion for this complication.

**Correct Answer: D. Hemorrhage**