[問題] 一個英文改錯問題

[DOC (.......)]

Greatly high production costs, together with serious health and safety
concerns, have reduced the number of nuclear power plants being built
today.
請問ㄧ下上面紅字的部分哪個是錯的?(選擇題  四選一)
還有應該怎麼修正
謝謝~~

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