Ed M. answered 12/17/15
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Help with grammar, French, SAT Writing, the TOEFL and ESL.
Of these choices, I would say "A. It convinced many European kingdoms to participate in the Crusades" would be the best answer to your question, even though the Crusades didn't begin in earnest until about five centuries after the fall of the Roman Empire, so because of that long time it might seem strange to say this "stabilized" Europe, i.e., normally something in need of "stabilization" needs it right away. Europe did go through what's often termed the "Dark Ages" following the fall of Rome, but even then there really wasn't that much political nor social "instability" on the continent.