Reading the sentence, we realise that there is NO contrast provided any where in the sentence and hence the use of "although" & "but" is useless ...
So option A, B and C are out ...
Option E : is a run on sentence ...there is no verb for the main clause "devoted to local history ...."
Left with only option D which is correct ...
This option is simply saying that :
There are dozens of X type of museums and there are also Y types of museums that open for exploration
...
So option A, B and C are out ...
Option E : is a run on sentence ...there is no verb for the main clause "devoted to local history ...."
Left with only option D which is correct ...
This option is simply saying that :
There are dozens of X type of museums and there are also Y types of museums that open for exploration
...
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