You are answering a USMLE-style medical question. Question: A gunshot victim is brought to the Emergency Department and appears to be in shock. You note a penetrating wound at the level of L3. Assuming the bullet remained at this level, which vascular structure might have been injured? Options: A) Inferior vena cava B) Internal iliac vein C) Renal artery D) Portal vein Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.