Which sentence from the story best indicates the unreliability of the narrator? a. "i was never kinder to the old man than during the whole week before i killed him. " b. "to think that there i was, opening the door, little by little, and he not even to dream of my secret deeds or thoughts." c. "no doubt i now grew very pale; – but i talked more fluently, and with a heightened voice. " d. "i swung the chair upon which i had been sitting, and grated it upon the boards, but the noise arose over all and continually increased."