Why do some historians credit President Reagan with ending the Cold War?

A. His support of the nuclear freeze movement encouraged negotiations between the United States and the Soviet Union.
B. His arms buildup strategy forced the Soviet Union to abandon its military competition with the United States.
C. His policy of détente ended hostile relations between the United States and the Soviet Union.
D. His military initiative against the Contras significantly weakened the Soviet Union’s presence in the West.

Idon't think any of em are right, you need to add the number of what paragraph you got your citation from

In 911, a group of vikings lead by rollo besieged paris and chartres. after a victory near chartres on 26 august, charles decided to negotiate with rollo. the talks were led by hervé, the archbishop of reims. this resulted in the treaty of saint-clair-sur-epte, which granted rollo and his soldiers all the land between the river epte and the sea. it also granted him brittany, "for his livelihood". at the time, brittany was an independent land which france had not been able to conquer. in exchange, rollo promised the king his loyalty and military assistance when needed. also rollo also agreed to be baptised and to marry gisela, the king's daughter. the territory given rollo is about the same as upper normandy. this would grow to become normandy under rollo's descendants. - wikepedia