15 . Which of the following is the least effective wayto guard against problems when negotiating aconstruction contract ?

A、 Do not anticipate problems , but instead writechangeorder later for any necessary adjustments to the contract .
B、 Communicate frequently with the owner todetermine what exactly is to be done and toinsure that the owner understands the contract
C、 Document all contracts and change orders inwriting , and have all parties sign these agreements
D、 Recheck the terms of the contract with the owner