Which sentence uses a reflexive pronoun correctly?

A. A hedgehog will roll hisself into a tight ball when threatened by another animal.
B. Hedgehogs, though unrelated to porcupines, also use sharp spines to protect itselves from danger.
C. Animals that attempt to hunt porcupines and hedgehogs often injure themselves in the process.
D. Porcupines use their coats of long, sharp quills to defend theirself from predators.