大全562，E错在哪里？

562.        One reason why more young people lose their virginity during the summer than at other times of the year undoubtedly is because school vacations give adolescents more free time.

(A) One reason why more young people lose their virginity during the summer than at other times of the year undoubtedly is because

(B) If young people lose their virginity more during the summer than other seasons, it is undoubtedly because

(C) One undoubtable reason that young people lose their virginity more during the summer than other times is

(D) One reason more young people lose their virginity during the summer than at other times of the year is undoubtedly that（D）

(E) Young people lose their virginity more often during the summer undoubtedly because, for one reason,

觉得这道题E也读得挺顺的，没发现什么不对的地方，难道是因为过分地改变了原句的结构？但是貌似没有改变原意啊。

请NN赐教

(E) Young people lose their virginity more often during the summer undoubtedly because, for one reason,（红线部分的两个词语意思重复吗？）

是这样吗？但是这里FOR ONE REASON是个插入语，插入语里的语言重复也是错误的吗？我认为应该不影响句子主干。。。

谢谢！！！

啰嗦、啰嗦、太啰嗦了。

另外，句意改变了。

原句比较的是more young people than，E是more often than。

哦，谢谢!这下真正知道了！！！

答案选D。ONE REASON WHY的说法是错误的