Sentence Correction

graghukalyan wrote: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
(here the either or construction is not used in parallel)

(B) Although dozens of New York�s small museums are devoted to local history or various ethnic groups,
(this choice doesn't complete the sentence)

(C) Dozens of New York�s small museums are devoted to local history or various ethnic groups, but there are
(initially I chose this choice but later I found that 'but', which is needed to express contrast, shouldn't be used here.Here the second part of the sentence doesn't convey any contrast.)

(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
(this choice doesn't make a complete sentence)

OA - D
Pls provide explanations as the answer to me looks not so plausible.