**Core Concept**
The intestinal villi are swollen and distended due to an accumulation of material within the lamina propria, suggesting an abnormal storage or accumulation of substances in the intestinal mucosa. This scenario is characteristic of a specific type of storage disorder.

**Why the Correct Answer is Right**
The presence of large granular macrophages containing material that stains strongly with periodic acid-Schiff (PAS) indicates the accumulation of glycogen or other carbohydrate-rich substances within the intestinal cells. This is a hallmark feature of Gaucher's disease, a lysosomal storage disorder caused by a deficiency of glucocerebrosidase enzyme. The accumulated glucocerebroside is then engulfed by macrophages, leading to their distension and accumulation in the lamina propria.

**Why Each Wrong Option is Incorrect**
**Option A:** This choice might be tempting due to the involvement of macrophages, but it does not specifically point towards a storage disorder like Gaucher's disease.
**Option B:** This option is incorrect because it does not correlate with the histopathological features described in the question.
**Option C:** This choice is not relevant to the scenario described, which involves storage of substances within the intestinal cells.

**Clinical Pearl / High-Yield Fact**
When encountering histopathological features of storage disorders like Gaucher's disease, remember to look for the presence of large granular macrophages containing PAS-positive material, which is a characteristic finding in this condition.

**Correct Answer:** C. Gaucher's disease.