845. The utility company has announced that it will permanently close its Unit I nuclear power plant, the first plant that had been built by private industry and the model for a generation of modern nuclear reactors.

(A) that had been built by private industry and
(B) built by private industry and which was
(C) to be built by private industry and which was
(D) built by private industry and
(E) to have been built by private industry and was

OA D