Critical burns in children include:

A. any superficial or partial-thickness burn that involves the legs or arms.
B. partial-thickness burns covering more than 20% of the body surface.
C. second-degree burns covering more than 10% of the body surface.
D. superficial burns covering more than 10% to 15% of the body surface.

Answer: B. partial-thickness burns covering more than 20% of the body surface.