请教一道题目

        Although dozens of New York’s small museums are either devoted to local history or various ethnic groups, there are many one-of-a-kind museums from Manhattan to the Bronx that are open for exploration on summer weekends.

(A) Although dozens of New York’s small museums are either devoted to local history or various ethnic groups, there are

(B) Although dozens of New York’s small museums are devoted to local history or various ethnic groups,

(C) Dozens of New York’s small museums are devoted to local history or various ethnic groups, but there are

(D) Dozens of New York’s small museums are devoted to local history or various ethnic groups, and there are also

(E) Devoted to local history or various ethnic groups, dozens of New York’s small museums and also

答案是D,我选的是B.请教为什么Ｂ不正确．

还有，答案Ｄ后半句补足了there are ，怎么感觉有点罗嗦，和前面半句不对称了？