Which sentence uses punctuation correctly?

A.
The discovery, which was the first of its kind in several years, caused an international stir.

B.
The discovery, which was the first of its kind in several years caused an international stir.

C.
The discovery which was the first of its kind, in several years, caused an international stir.

D.
The discovery which was the first of its kind in several years, caused an international stir.
Question

Question

Which sentence uses punctuation correctly?	
 
 A.
The discovery, which was the first of its kind in several years, caused an international stir.
 
 B.
The discovery, which was the first of its kind in several years caused an international stir.
 
 C.
The discovery which was the first of its kind, in several years, caused an international stir.
 
 D.
The discovery which was the first of its kind in several years, caused an international stir.
Question

mysticfury · Answer

it would be A since , appositives need to be inside commas