**Core Concept**
Chronic gastritis caused by Helicobacter pylori (H. pylori) is a common gastrointestinal disorder characterized by chronic inflammation of the gastric mucosa. The pathologic features of H. pylori chronic gastritis include mucosal atrophy, intestinal metaplasia, and increased gastric acidity.

**Why the Correct Answer is Right**
H. pylori infection leads to chronic gastritis through the production of urease, which breaks down gastric mucin and disrupts the mucosal barrier. The infection also triggers a chronic inflammatory response, resulting in mucosal atrophy and intestinal metaplasia. Additionally, H. pylori infection can lead to increased gastric acidity due to the loss of parietal cells and the production of gastrin.

**Why Each Wrong Option is Incorrect**
**Option A:** Mucosal atrophy is a pathologic feature of H. pylori chronic gastritis.
**Option B:** Intestinal metaplasia is a pathologic feature of H. pylori chronic gastritis.
**Option C:** Increased gastric acidity is a pathologic feature of H. pylori chronic gastritis.

**Clinical Pearl / High-Yield Fact**
It's essential to note that H. pylori infection is a significant risk factor for the development of gastric cancer. The presence of H. pylori infection should be considered in patients with chronic gastritis, and eradication therapy should be considered to prevent complications.

**Correct Answer: D.**