**Core Concept**
A benign gastric ulcer is a mucosal defect in the stomach lining, typically caused by Helicobacter pylori infection or nonsteroidal anti-inflammatory drug (NSAID) use. The radiological findings of a benign gastric ulcer are distinct from those of malignant ulcers.

**Why the Correct Answer is Right**
The correct radiological finding of a benign gastric ulcer is the "shoulder sign." This sign refers to the presence of a well-defined, rounded or oval-shaped ulcer crater with a distinct edge, often surrounded by a narrow rim of normal mucosa. The "shoulder sign" is characteristic of benign ulcers due to the presence of a fibrotic border, which is a result of the body's attempt to heal the ulcer. This fibrotic border gives the ulcer a rounded appearance on imaging.

**Why Each Wrong Option is Incorrect**
* **Option A:** The "cobblestone appearance" is typically seen in Crohn's disease, which is a type of inflammatory bowel disease.
* **Option B:** The "target sign" is seen in gastrointestinal stromal tumors (GISTs), which are typically malignant.
* **Option C:** The "double wall sign" is seen in gastric cancer, where the tumor invades the stomach wall, causing a double density on imaging.

**Clinical Pearl / High-Yield Fact**
The "shoulder sign" is a key radiological feature of benign gastric ulcers, and its presence can help distinguish these ulcers from malignant ones. This knowledge is essential for radiologists and gastroenterologists to accurately diagnose and manage patients with gastric ulcers.

**Correct Answer:** C.