**Core Concept**
The clinical presentation suggests a hip disorder, likely related to the **femoral head** or **hip joint**. The symptoms of limited abduction and internal rotation, along with tenderness in **Scarpa's triangle**, indicate a possible issue with the **femoral head** or its blood supply.

**Why the Correct Answer is Right**
The correct answer is related to a condition that affects the **femoral head**, causing pain and limited mobility. The **Slipped Capital Femoral Epiphysis (SCFE)** is a condition where the **femoral head** slips off the **femoral neck**, leading to pain, limited abduction, and internal rotation.

**Why Each Wrong Option is Incorrect**
**Option A:** This choice is incorrect as it does not match the classic symptoms of limited abduction and internal rotation.
**Option B:** Similarly, this choice does not align with the clinical presentation.
**Option C:** This option is also incorrect as the symptoms do not correlate with the provided diagnosis.

**Clinical Pearl / High-Yield Fact**
A key point to remember is that **SCFE** is more common in **obese** adolescents, and the condition can lead to **avascular necrosis** of the **femoral head** if not promptly treated.

**Correct Answer:** D. Slipped Capital Femoral Epiphysis.