听力原文:M: If an instrument is payable to the order of both A and B who are not partners,
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.