**Core Concept**
The anatomical position of the scapula and its relation to the vertebral column is crucial for understanding the musculoskeletal anatomy of the back. The **scapula** is a flat, triangular bone located posteriorly on the **thoracic cage**. Its position is often referenced in relation to the **vertebral bodies**.

**Why the Correct Answer is Right**
The lower angle of the **scapula** is typically at the level of the **7th thoracic vertebra (T7)**. This is because the scapula spans from about the **2nd to the 7th thoracic vertebrae** when the arm is at rest by the side of the body. The **lower angle** is one of the three angles of the scapula and serves as an attachment point for several muscles.

**Why Each Wrong Option is Incorrect**
**Option A:** This is incorrect because the lower angle of the scapula does not correspond to this level.
**Option B:** Similarly, this option does not accurately represent the level of the lower angle of the scapula.
**Option D:** This option is also incorrect as it does not match the anatomical level of the lower angle of the scapula.

**Clinical Pearl / High-Yield Fact**
Remembering the level of the lower angle of the scapula is important for clinical examinations, particularly for assessing musculoskeletal injuries or diseases affecting the thoracic spine and shoulder girdle.

**Correct Answer:** C. 7th thoracic vertebra.