Which Statement About Sensory Cortical Maps Is True

Which statement about sensory cortical maps is true?

A) Cortical maps can change with an animal's experience and training only at early ages.
B) Plasticity of cortical maps is found in only a few mammals.
C) Plasticity of cortical maps may arise from changes in the strength of existing synapses or the formation or loss of synapses.
D) If a body part is surgically removed, its designated area of the cortical map will remain.