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Which sentence uses punctuation correctly?

AThe discovery, which was the first of its kind in several years, caused an international stir.
BThe discovery which was the first of its kind in several years, caused an international stir.
CThe discovery, which was the first of its kind in several years caused an international stir.
DThe discovery which was the first of its kind, in several years, caused an international stir.

Verified Answer :

The correct answer is C because it pauses after stating who did what.


IĀ am certainĀ that it is A as which was the first of its kind in several years is the subordinate clause and *the discovery caused an international stir is the main clause. :)