TOEFL Reading: ETS-TOEFL阅读机经 - I9402H7A58MJIB6TL$

According to paragraph 5, what is one way that internal conflict in Rome endangered the peace and safety of the West A. The conflict made it more difficult to make peace through the process of granting imperial titles and territorial concessions. B. The conflict made it easier for invaders to cross the frontier and enter Roman territory. C. The conflict discouraged Roman leaders from creating alliances and coalitions with Germanic tribes. D. The conflict made it nearly impossible to track the activities of enemy tribes outside Roman territory.