Sentence Correction

78. 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

OA is D. Why is A wrong?

The word "although" is always used to contrast the first part of the statement with the second part. This question describes two sets of museums: one devoted to local history or ethnic groups and the other devoted to museums that are open on summer weekends. There is no clear contrast implied.

The first three choices (A,B,C) are written with incorrect comparisons. The last choice (E) changes the meaning.

D is the correct answer.