1. 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（D）
(E) to have been built by private industry and was
弱弱得问一句，为什么不选A阿，build这个动作发生在has announced之前阿，所以那时候就觉的要用had been built。
请给个意见，谢谢~
原文的build并没有比较两个动作先后的次序，一个在主句里，一个在从句里。
而且，这里并没有表示从过去一个时间开始到过去一个时间截止的动作概念，所以不用过去完成时。
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