Rhinoceros Horns Differ from Other Horns or Antlers Because They

Rhinoceros horns differ from other horns or antlers because they

A) are not attached to the skull.
B) are shed annually.
C) consist of hair-like keratinized filaments that arise from dermal papillae cemented together but not attached to the skull.
D) are one big hair follicle.
E) can be easily harvested from living animals without harming the animal.