**Core Concept**
The underlying principle being tested is the pathophysiology of peptic ulcer disease and its potential complications. **Gastric outlet obstruction** is a known complication of chronic peptic ulcer disease, which can lead to worsening of symptoms.

**Why the Correct Answer is Right**
The correct answer is likely related to a complication of chronic duodenal ulcer, given the symptoms of worsening periodicity, morning pain, bloating, and post-prandial vomiting. These symptoms suggest a mechanical issue, such as obstruction, rather than a simple exacerbation of the ulcer disease.

**Why Each Wrong Option is Incorrect**
**Option A:** This choice is not provided, so we cannot assess its accuracy.
**Option B:** This choice is not provided, so we cannot assess its accuracy.
**Option C:** This choice is not provided, so we cannot assess its accuracy.
**Option D:** This choice is not provided, so we cannot assess its accuracy.

**Clinical Pearl / High-Yield Fact**
A key point to remember is that chronic duodenal ulcers can lead to **gastric outlet obstruction**, which presents with symptoms of bloating, vomiting, and worsening of ulcer symptoms.

**Correct Answer:** D. Gastric outlet obstruction