**Core Concept**
Gastric ulcers are classified based on their location within the stomach. Type III gastric ulcers are located on the lesser curvature of the stomach, which is a critical anatomical area for gastric acid secretion and mucosal protection.

**Why the Correct Answer is Right**
Type III gastric ulcers are distinct from other types due to their location on the lesser curvature. This area is rich in mucous glands, which help protect the underlying mucosa from acidic gastric juice. However, the presence of Helicobacter pylori infection or nonsteroidal anti-inflammatory drugs (NSAIDs) can disrupt this protective mechanism, leading to ulcer formation. The lesser curvature is also a common site for gastric ulcers due to the proximity of the antrum and the pylorus, where gastrin secretion is highest.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because it does not specify a valid location for a gastric ulcer.
* **Option B:** This option is incorrect because it does not accurately describe the location of a Type III gastric ulcer.
* **Option C:** This option is incorrect because it does not correspond to a recognized classification of gastric ulcers.

**Clinical Pearl / High-Yield Fact**
Remember that the lesser curvature of the stomach is a common site for gastric ulcers, particularly Type III, due to the presence of mucous glands and high gastrin secretion in this area.

**Correct Answer:** D