Which sentence from the article shows the author's MAIN problem when researching Kristallnacht?

A: When I started to watch interviews with German-Jewish survivors of the Holocaust, I was surprised to hear many of them talk about the destruction of their homes during Kristallnacht.

B: Yet none of these stories appeared in traditional accounts of Kristallnacht.

C: Some years later, I found a document from Schneidemühl, a small district in eastern Germany, that listed the destruction of a dozen synagogues, over 60 shops and 231 homes.

D: A fuller picture of the brutal destruction of Jewish homes and apartments soon emerged.

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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