After planning on what to do to try missing school, Tom found himself groaning hardly, but still with no success on waking Sid up. So Tom call him out and "shook him" and "went on groaning". Sid started getting anxious watching him, trying to make Tom stop groaning, what just made Tom improve his acting, saying between groans: "I forgive you everything, Sid. Everything you've ever done to me. When I'm gone--". That was enough to Sid answer: "Oh, Tom, you ain't dying, are you? Don't, Tom--oh, don't. Maybe--", then Sid fled to bring Aunt Polly to help.
With that letter D (Tom groans and says, “ when I’m gone…”, so Sid will call for Aunt Polly’s helps) is correct in the first question and letter A is correct in the second question (so it becomes anxious and asks if Tom is dying).