**Core Concept**
The renal angle, also known as the costovertebral angle (CVA), is an anatomical landmark on the back that is used to assess for kidney problems. It is the area where the 11th and 12th ribs meet the vertebral column, specifically the T12-L1 junction.

**Why the Correct Answer is Right**
The renal angle is significant because it is the location where the kidneys are palpable during a physical examination. The kidneys are retroperitoneal organs, meaning they are located behind the peritoneum, a membrane that lines the abdominal cavity. The renal angle is the area where the peritoneum is thin, allowing the kidneys to be felt during a thorough examination. This is particularly useful in diagnosing conditions such as pyelonephritis, kidney stones, or other kidney diseases.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not accurately describe the renal angle. While it is a location on the back, it is not the specific area where the kidneys are palpable.
**Option B:** This option is incorrect because it refers to a different anatomical landmark on the back. The lumbar triangle is located between the latissimus dorsi and the external oblique muscles, and is not related to the kidneys.
**Option C:** This option is incorrect because it refers to a different anatomical landmark on the back. The scapula is a bone that forms the shoulder blade, and is not related to the kidneys.

**Clinical Pearl / High-Yield Fact**
When examining a patient for kidney problems, it is essential to assess the renal angle to determine if the kidneys are palpable. This can help diagnose conditions such as pyelonephritis or kidney stones, which may require prompt medical attention.

**Correct Answer: C. The costovertebral angle (CVA) is the location where the kidneys are palpable during a physical examination.**