现在进行时的初步运用 — 英语选择题

放学后的教室里很热闹。老师发消息说：'Nobody is sleeping now. Lily isn't drawing. Tom isn't reading. Lily is reading, and Tom is drawing.' 根据老师的话，现在正在发生的正确情况是（　　） A. Lily is drawing, and Tom is reading. B. Lily is reading, and Tom is drawing. C. Lily is sleeping, and Tom is reading. D. Nobody is reading or drawing.