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.
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.