听力原文：M: If an instrument is payable to the order of both A and B who are not partners, what should they do? W: Both of them must endorse, unless one has authority to endorse for the other. Q: Which of the following is not right according to the woman? (18) A.Both endorse the instrument. B.Neither of them endorses the instrument. C.A authorizes B to endorse the instrument. D.B authorizes A to endorse the instrument.