单选题 It may be inferred from the passage that by studying the brains of narcoleptic dogs, the author learned that

• (A) neural degeneration may occur too early for scientists to be able draw many useful conclusions about it
• (B) a loss of neurons would be undetectable unless the dead cells were concentrated in a particular area of the brain
• (C) pathologists not only were researching the wrong stage of the disease process, but ignoring its unique effects on different species
• (D) the brain tends through its natural processing to remove the effects of neural degeneration
• (E) the theories of Aldrich and Mignot were largely correct, at least as far as dogs are concerned