**Core Concept**
The pancreas is an organ with considerable anatomic variation, and understanding these variations is crucial for diagnosis and treatment of pancreatic disorders. **Congenital anatomic variants** of the pancreas can affect its shape, size, and position. The most common variation involves the way the pancreas forms during embryological development.

**Why the Correct Answer is Right**
The correct answer is related to the way the pancreatic tissue develops and migrates during fetal development. The most common congenital anatomic variant is **pancreas divisum**, where the pancreas fails to fuse properly, resulting in two separate pancreatic ducts. This occurs due to the abnormal rotation and fusion of the **ventral** and **dorsal pancreatic buds** during embryogenesis.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not accurately describe the most common congenital anatomic variant of the pancreas.
**Option B:** Similarly, this option is not the most common variant.
**Option D:** This option also does not represent the most common congenital anatomic variant.

**Clinical Pearl / High-Yield Fact**
It's essential to recognize that **pancreas divisum** can be associated with an increased risk of **pancreatitis**, as the abnormal pancreatic ducts can lead to inadequate drainage of pancreatic secretions.

**Correct Answer:** D. Pancreas divisum.