10. When___________, the objective is to find an expedient, mutually acceptable solution that partially satisfies both parties

According to the passage, some GIs' brutal crimes against the South Korean populace ______. A: have been used as a pretext by some for their own expedient political purposes B: have caused damage to the reputation of every individual U.S. Serviceman in South Korea C: have delayed the plan to move the U.S. base to another location D: have worsened the official bilateral relation of U.S. and South Korea