Sentence Completion
Verbal Ability

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War has been, throughout history, the chief _________ of social cohesion; and since science began, it has been the strongest ________ to technical progress.


Reason, encouragement


origin, boost


cause, provocation


source, incentive

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Option(D) is correct

In the given space of time i.e. 'throughout history' there can be only source. Reason and cause or origin can be a particular event.
Boost, Encouragement and Incentive mean the same.

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