**Core Concept**
Open reduction (OR) is a surgical procedure that involves exposing a fracture to visually align and stabilize the bone fragments. The decision to perform OR depends on the fracture's severity, location, and the patient's overall health.

**Why the Correct Answer is Right**
The correct answer is not explicitly stated in the question, but we can infer that OR is not required in certain fractures that are easily manageable with closed reduction (CR) and immobilization. For instance, fractures that are minimally displaced, stable, and not significantly affecting the joint's function may not require OR. In these cases, CR and immobilization with a splint or cast can be sufficient to allow healing.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because most fractures, regardless of their severity, require immobilization to facilitate healing. OR is usually reserved for complex fractures that cannot be managed with CR.
**Option B:** This option is incorrect because even nondisplaced fractures may benefit from OR to ensure accurate alignment and prevent future complications.
**Option C:** This option is incorrect because fractures that are significantly displaced or unstable often require OR to restore the bone's original anatomy and function.

**Clinical Pearl / High-Yield Fact**
In orthopedic trauma, the decision to perform OR should be based on the fracture's severity, location, and the patient's overall health. A general rule of thumb is that fractures that are minimally displaced and stable can be managed with CR and immobilization, while more complex fractures require OR.

**Correct Answer: D.**