听力原文:If a letter of credit is issued irrevocably, it can't be canceled nor amended wit
(4)
A.An irrevocable L/C can not be committed to amendment.
B.An irrevocable L/C can not be cancelled without permission.
C.An irrevocable L/C can not be cancelled or amended.
D.Neither cancellation nor amendment without permission can be made to the irrevocable L/C.