To attempt at curbing the water hyacinth

To attempt at curbing the water hyacinth, an ornamental plant which was infesting Lake Victoria and was native of the Brazilian rain forest, ecologists are introducing weevils and fungi into the lake's ecosystem.

A. To attempt at curbing the water hyacinth, an ornamental plant which was infesting Lake Victoria and was native of.

B. The attempt at curbing the infesting of Lake Victoria of the water hyacinth, an ornamental plant which is a native to.

C. In an attempt to curb the water hyacinth, an ornamental plant which had been infesting Lake Victoria and had been native to.

D. In an attempt to curb the infestation of Lake Victoria by the water hyacinth, an ornamental plant native to.

E. By attempting to curb Lake Victoria's infestation of the water hyacinth, an ornamental plant native in.