**Core Concept**
Epley's maneuver is a series of physical movements used to treat a specific condition related to the **vestibular system**. It involves a sequence of head and body positions to help relieve symptoms. The underlying principle is to manipulate the **otoliths** in the inner ear.

**Why the Correct Answer is Right**
The correct answer is related to **Benign Paroxysmal Positional Vertigo (BPPV)**, a condition characterized by brief, intense episodes of vertigo triggered by specific head movements. Epley's maneuver is designed to move the **otoliths** from the **semicircular canals** to the **utricle**, where they will not cause symptoms.

**Why Each Wrong Option is Incorrect**
**Option A:** Not related to Epley's test.
**Option B:** Not related to Epley's test.
**Option C:** Not the primary condition treated by Epley's maneuver, though it may be related to vestibular issues.

**Clinical Pearl / High-Yield Fact**
Epley's maneuver is a simple, effective treatment for **BPPV**, and its success relies on accurately diagnosing the condition.

**Correct Answer:** D. Benign Paroxysmal Positional Vertigo (BPPV)