**Core Concept**
The duodenum receives blood supply from various branches of the aorta and its branches, ensuring adequate oxygenation and nutrient delivery for digestion and absorption.

**Why the Correct Answer is Right**
The duodenum is primarily supplied by the superior mesenteric artery (SMA) and the gastroduodenal artery, which arises from the common hepatic artery. The SMA provides the superior pancreaticoduodenal artery, while the gastroduodenal artery gives off the right gastroepiploic and superior pancreaticoduodenal arteries. The inferior pancreaticoduodenal artery, a branch of the superior mesenteric artery, also supplies the duodenum.

**Why Each Wrong Option is Incorrect**
**Option A:** The celiac trunk primarily supplies the stomach, liver, spleen, and the proximal part of the duodenum via the common hepatic artery.
**Option B:** The left gastric artery is a branch of the celiac trunk and supplies the stomach.
**Option C:** The inferior mesenteric artery primarily supplies the distal part of the transverse colon, the descending colon, the sigmoid colon, and the rectum.

**Clinical Pearl / High-Yield Fact**
It's essential to remember the blood supply to the duodenum, as understanding this can aid in diagnosing conditions like mesenteric ischemia, where reduced blood flow to the intestines can cause severe abdominal pain and potentially life-threatening complications.

**Correct Answer: A. The celiac trunk primarily supplies the stomach, liver, spleen, and the proximal part of the duodenum via the common hepatic artery.**