参考答案

正确答案：D
解析：根据题干关键词History，teaches，grandfather's aunt family定位到原文第二段最后两句： Despite the ever tightening noose on Jewish rights. my great-grand-aunt's family refused to accept the reality of the situation, and they paid too great a price for their trust, because her relatives and so many others like them perished in the Holocaust. History proved them wrong. 历史证明他们是错误的。D)项“他们错了，应该相信我爷爷的姑妈”符合题意。