Hi mukherjee.tanuj3,

To answer your initial question, the word "there" can be used to refer to a location or to present a specific piece of information (e.g.. THERE are 4 sections on the GMAT).

This SC includes a few answers that imply some type of contrast, but none of the "contrasts" is presented correctly, and the non-underlined portion of the sentence doesn't give us any contrast "words" to work with (or, nor, than, etc.). You might find it easier to eliminate the wrong answers and "zero in" on the correct one.

Answer A: the word "either" needs to followed by an "or" at some point. The "or" is not here. Eliminate A.

Answer B: the word "Although" implies a contrast; the first part of the sentence offers "dozens of....museums are devoted to local history or various ethnic groups." The second part of the sentence should contrast this point, but instead offers "many...museums are open for exploration on summer weekends." This is not a contrasting statement. Eliminate B.

Answer C: the word "but" implies the same contrast as in Answer B; it also suffers from the same problem - the statements don't contrast one another. Eliminate C.

Answer E: the words "and" and "also" are redundant when placed side-by-side. Eliminate E.

Final Answer: D

GMAT assassins aren't born, they're made,
Rich