In the manner of my friend I was at once struck with an incoherence—an inconsistency; and I soon found this to arise from a series of feeble and futile struggles to overcome an habitual trepidancy—an excessive nervous agitation. For something of this nature I had indeed been prepared, no less by his letter, than by reminiscences of certain boyish traits, and by conclusions deduced from his peculiar physical conformation and temperament. His action was alternately vivacious and sullen. His voice varied rapidly from a tremulous indecision to that species of energetic concision—that abrupt, weighty, unhurried, and hollow-sounding enunciation—that leaden, self-balanced and perfectly modulated guttural utterance.
1Bored (I don't know if this would help)

Which of the following descriptions does Poe use to directly illustrate the “incoherence” and “inconsistency” of Usher?

A.suffered to grow all unheeded
B.His voice varied rapidly
C.ghastly pallor of the skin
D.A cadaverousness of complexion