一个语法题···

这是新东方蓝皮上的一个题目 自己实在想不出答案 网上也搜不到·· 所以拿来问问 希望有好心人帮我解答啦 先在此谢谢啦！

 One of Ronald Reagan’s first acts as President was to rescind President Carter’s directive that any chemical banned on medical grounds in the United States be prohibited from sale to other countries.
(A) that any chemical banned on medical grounds in the United States be prohibited from sale to other countries
(B) that any chemical be prohibited from sale to other countries that was banned on medical grounds in the United States
(C) prohibiting the sale to other countries of any chemical banned on medical grounds in the United States
(D) prohibiting that any chemical banned on medical grounds in the United States is sold to other countries
(E) that any chemical banned in the United States on medical grounds is prohibited from being sold to other countries

答案是c 我选的a

directive 后的从句要用虚拟语气？我没听说过

所以选c

谢谢了··