**Core Concept**
When a child is spun around by the hand, it can cause a specific injury to the elbow joint due to the sudden and forceful stretching of the annular ligament. This type of injury is common in children and is often referred to as a "pulled elbow."

**Why the Correct Answer is Right**
The correct answer is A. Pulled elbow, also known as nursemaid's elbow. This condition occurs when the radial head subluxates (partially dislocates) due to the sudden force applied to the extended elbow, causing the annular ligament to become stretched and the radial head to slip out of its normal position. The child may exhibit pain, crying, and refusal to move the affected arm, as seen in the scenario described. The annular ligament plays a crucial role in holding the radial head in place, and its stretching or tearing can lead to this type of injury.

**Why Each Wrong Option is Incorrect**
**Option B:** Radial head dislocation is a more severe injury that involves a complete dislocation of the radial head, which is not typically seen in pulled elbow.

**Option C:** Annular ligament tear is a possible complication of pulled elbow, but it is not the primary diagnosis in this scenario.

**Option D:** Fracture olecranon process is a different type of injury that involves a break in the olecranon bone, which is not related to the mechanism of injury described in the scenario.

**Clinical Pearl / High-Yield Fact**
Pulled elbow is a classic example of a "minor" injury that can be very painful for children. It is essential to recognize the characteristic presentation and manage it promptly to avoid unnecessary distress and potential complications.

**✓ Correct Answer: A. Pulled elbow**