【单选题】

According to the passage, scientists have positively confirmed that the brains of narcoleptics differ from those of normal brains in which of the following ways
A．(A) Narcoleptic brains tend to remove degenerative tissue at a more prolific rate than that of nonnarcoleptics.

B．(B) Narcoleptics are less responsive to drugs which treat neural autoimmune dysfunction than are nonnarcoleptics.
C．(C) Nonnarcoleptics do not possess the same neurological immune antigens as narcoleptics.
D．(D) Neurons that control muscle tone are damaged in the brains of narcoleptics, but not in those of non-narcoleptics.
E．(E) Narcoleptics experience greater neural degeneration as a result of aging than do nonnarcoleptics.