GMAT Sentence Correction (SC) | Re: Imported into Massachusetts from Europe in 1869, the gypsy

A. Imported into Massachusetts from Europe in 1869, the gypsy moth was used by a French scientist inan attempt at developing a strong strain of silk-producing insects, crossing gypsy moths with adult silkworms.
B.Imported into Massachusetts from Europe in 1869, aFrench scientist was attempting to develop a strong strain of silk-producing insects by crossing gypsy moths with adult silkworms.
C. To cross gypsy moths with adult silkworms, in attempting the development of a strong strain of silk-producing
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