**Core Concept**
The **fracture neck of the femur** is a common injury that can lead to significant morbidity if not properly managed. The **blood supply** to the femoral head plays a crucial role in the healing process.

**Why the Correct Answer is Right**
Since the correct answer is not provided, let's discuss the general factors that contribute to non-union in fracture neck of the femur. These include **disruption of the blood supply**, **poor reduction**, and **inadequate immobilization**. The **retinacular arteries** and **ligamentum teres** are key structures involved in the blood supply to the femoral head.

**Why Each Wrong Option is Incorrect**
**Option A:** Without the specific option, it's challenging to provide a detailed explanation. However, factors such as **advanced age**, **smoking**, and **poor nutritional status** can contribute to non-union.
**Option B:** Similarly, without the specific option, it's difficult to provide a detailed explanation. However, **excessive movement** at the fracture site can disrupt the healing process.
**Option C:** Again, without the specific option, it's challenging to provide a detailed explanation. However, **infection** can also lead to non-union by disrupting the healing process.
**Option D:** As with the other options, without the specific details, it's difficult to provide a detailed explanation. However, **corticosteroid use** can impair bone healing.

**Clinical Pearl / High-Yield Fact**
A key point to remember is that **timely and appropriate management** of fracture neck of the femur is crucial to prevent non-union. This includes **anatomical reduction** and **stable fixation** to promote healing.

**Correct Answer:** Not provided.