Which of the following responses describes a greenstick fracture?

A. A fracture that has not broken through the skin is called a closed or simple fracture, not a greenstick fracture. B. A greenstick fracture occurs when the bone bends and cracks but does not break completely, commonly seen in children due to their softer bones. C. A bone broken into two distinct pieces is a complete fracture. D. Bone shattered into more than two pieces is called a comminuted fracture.