While solving such question you need to first analyze the original sentence and understand the meaning
As per the Option A
In studying pre-industrial Europe, these historians have focused on only the 2 or 3 percent of the population that comprised the political and social elite, but they have generally overlooked the rest, thereby failing to understand European civilization as a whole.
3 facts have been mentioned about the historians
1) They have been studying pre-industrial Europe
2) In
...
As per the Option A
In studying pre-industrial Europe, these historians have focused on only the 2 or 3 percent of the population that comprised the political and social elite, but they have generally overlooked the rest, thereby failing to understand European civilization as a whole.
3 facts have been mentioned about the historians
1) They have been studying pre-industrial Europe
2) In
...
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