**Core Concept**
The scenario describes a child who has suffered a fall onto an outstretched hand, resulting in pain and restricted movement. This presentation is suggestive of a possible fracture or injury to the wrist or forearm. The management of such injuries involves identifying the type and severity of the injury, stabilizing the affected area, and determining the need for further imaging or intervention.

**Why the Correct Answer is Right**
The X-ray is essential for diagnosing the extent of the injury. In this case, the child's symptoms are consistent with a possible scaphoid fracture. The scaphoid bone is a common site for fractures in children who fall onto an outstretched hand. A scaphoid fracture can be difficult to diagnose on initial X-ray, and it is essential to obtain a follow-up X-ray in 10-14 days to confirm the diagnosis. If the fracture is confirmed, management may involve immobilization in a cast or splint to allow healing.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because it does not address the need for X-ray imaging to confirm the diagnosis of a possible fracture.
* **Option B:** This option is incorrect because it does not specify the need for immobilization in a cast or splint, which is essential for healing a scaphoid fracture.
* **Option C:** This option is incorrect because it does not address the need for follow-up X-ray imaging to confirm the diagnosis of a possible scaphoid fracture.
* **Option D:** This option is incorrect because it does not provide a clear management plan for the child's injury.

**Clinical Pearl / High-Yield Fact**
When evaluating a child who has fallen onto an outstretched hand, it is essential to have a high index of suspicion for a scaphoid fracture, even if the initial X-ray appears normal. A follow-up X-ray in 10-14 days can help confirm the diagnosis and guide management.

**Correct Answer:** B. Immobilize the wrist in a cast or splint for 6-8 weeks to allow healing.