Which Statement Below Is True with Respect to the Electromagnetic

Which statement below is true with respect to the electromagnetic spectrum?

A) The portion of the electromagnetic spectrum that we can observe unaided is very small.
B) The electromagnetic spectrum is very narrow.
C) The electromagnetic spectrum is sorted by the speed of the waves that make up light energy.
D) The inherent energy of a particular region of the spectrum depends solely on the intensity of the light energy.
E) None of the above.