A letter of credit is a written undertaking by an issuing bank given to the seller（beneficiary） at the request， and on the instruction， of the buyer（applicant） to pay at sight or at a determinable future date up to a stated sum of money， within a prescribed time limit and against stipulated documents which（）the terms and conditions of the credit.

A.transfer

B.by

C.comply with

D.observe

正确答案：comply with