一道虚拟语气题

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

(C) prohibiting the sale to other countries of any chemical banned on medical grounds in the United States

很奇怪，答案是c，我怎么看都是A，that难道不是directive的同位语从句？

帮我看看吧，大家。。。