**Core Concept**
The midgut is a segment of the embryological hindgut, which develops into a significant portion of the gastrointestinal tract. The arterial supply to the midgut is crucial for its development and maintenance.

**Why the Correct Answer is Right**
The midgut is primarily supplied by the superior mesenteric artery (SMA). This artery arises from the abdominal aorta, below the celiac trunk, and supplies a significant portion of the small intestine, including the jejunum and ileum. The SMA also gives off several branches, including the jejunum and ileal branches, which further supply the midgut.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because the celiac trunk primarily supplies the foregut, which includes the stomach, liver, and pancreas.

**Option B:** This option is incorrect because the inferior mesenteric artery primarily supplies the hindgut, which includes the distal colon and rectum.

**Option C:** This option is incorrect because the gastroduodenal artery primarily supplies the stomach and duodenum, which are parts of the foregut.

**Clinical Pearl / High-Yield Fact**
The superior mesenteric artery syndrome, also known as the Wilkie's syndrome, occurs when the SMA compresses the duodenum, leading to obstruction and potentially severe complications.

**Correct Answer: D. Superior Mesenteric Artery**