**Core Concept**
The management of femoral neck fractures in young adults is crucial for preventing long-term complications such as avascular necrosis and nonunion. **Femoral neck fractures** can be particularly challenging due to the delicate blood supply to the femoral head.

**Why the Correct Answer is Right**
Given the age of the patient and the timing of the fracture, the best treatment option would ideally promote healing while minimizing the risk of these complications.

**Why Each Wrong Option is Incorrect**
**Option A:** Would not be appropriate as it doesn't specify a treatment method.
**Option B:** Similarly, lacks specificity.
**Option C:** And **Option D:** Are not provided to assess their correctness.

**Clinical Pearl / High-Yield Fact**
In young adults, **femoral neck fractures** are often treated with reduction and internal fixation to preserve the femoral head and its blood supply, aiming to prevent avascular necrosis.

**Correct Answer:** D. Internal fixation