一道题目求教.

Imported into Massachusetts from Europe in 1869, the gypsy moth was used by a French scientist in an attempt at developing a strong strain of silk-producing insects, crossing gypsy moths with adult silkwarms.

B. Imported into Massachesettes from Europe in 1869, a French scientist was attempting to develop a strong strain of silk-producing insects by crossing gypsy moths with adult silkwarms.

C. To cross gypsy moths with adult silkwarms, in attempting the development of a strong strain of sild-producing insects, a French scientist in 1869 imported the gypsy moth into Massachusetts from Europe.

D. The gypsy moth was imported into Massachusetts from Europe in 1869 by a French scientist attempting to develop a strong strain of silk-producing insects by crossing gypsy moths with adult silkwarms.

E. In an attemp at the development of a strong strain of silk-producing insects, a French scientist, importing the gypsy moth from Europe into Massachusetts in 1869 in order to cross gypsy moths and adult silkwarms.

对选C或D犹豫不定。想请教大家的看法。谢谢先了.