Many people assume the physical basis of language lies in the lips, the tongue, or the ear, ----.
A) because people who have no capacity to use their vocal cords can still comprehend language
B) whereas human sign language is an infinitely creative system just like spoken forms of language
C) so the basis of sign language is not in the hand, just as spoken language is not based in the lips or tongue
D) even if there are many people who lose both the ability to write as well as to express themselves using sign-language
E) but deaf and mute people can also possess language fully