Sentence Completion
Verbal Ability

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Q.

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

 A.

Reason, encouragement

 B.

origin, boost

 C.

cause, provocation

 D.

source, incentive

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Solution:
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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