The most common fracture in children is:

Correct option is D

A greenstick fracture is the most common type of fracture in children. This type of fracture occurs when the bone bends and cracks on one side without breaking all the way through, similar to how a green twig breaks. This happens because children's bones are more flexible than adult bones.
Explanation of options: (a) ✘ Incorrect. Comminuted fractures are more common in adults and involve the bone breaking into multiple pieces. (b) ✘ Incorrect. Stress fractures are small cracks in the bone due to overuse and are more common in athletes. (c) ✘ Incorrect. Compression fractures occur when the bone is compressed, often seen in the spine, and are less common in children. (d) ✔ Correct. Greenstick fractures are typical in children due to the flexibility of their bones.