This writing business is delightful, isn 't it? I said sarcastically at last, out loud, too. You see, I had reached the stage of imbecility when I was talking to myself. "Yes! " said a voice at the other end of the room, 'I should say it! " a) Why did the author say sarcastically "This writing business is delightful isn 't it "? b) What is the meaning of the word 'imbecility '? c) "Yes! " said a voice at the other end of the room. Whose voice was it?