In an attempt to guarantee the security of its innovative water purification method, the company required each employee to sign a confidentiality agreement prohibiting that its water purification methods be disclosed to companies using an analogous purification process.

A.      prohibiting that its water purification methods be disclosed to companies

B.      prohibiting them from the disclosing of its water purification methods to any company

C.     prohibiting disclosure of its water purification methods to any company

D.     that would prohibit them from disclosure of its water purification methods to companies

E.      that would prohibit its water purification methods to be disclosed to a company

答案为C,用prohibiting不会有歧义吗？

现在分词的确不能一概而论就是比过去分词差

如果分词修饰的对象是动作的发出者，且使用分词结构比从句简洁清晰，就使用现在分词，分词的使用是有时需要理解句子的逻辑含义、平行对称、主被动关系有效性、动作和状态的区别。还有就是固定用法，法规准则往往用现在分词修饰表示重复进行的不止一次的动作。

现在分词强调的是重复性动作,过去分词、定语从句强调的是一次性动作，

分词必须和分词对称.现在分词也可和过去分词对称，关键看动词的主语是动作的发出者还是承受者，

现在分词做状语可表示结果，

现在分词放在句末，表伴随修饰前面一整句话，

过去分词优于定语从句,因为过去分词是定语从句的省略形式，

*政府的法令directive,sentence,有强制性，因此有重复性，须使用现在分词

再补充几个：

A，分词在句首：为状语，逻辑主语等于主句主语

B，现在分词在句末：1，当做状语表示与主句谓语动作同时发生时，逻辑主语等于主句主语

                2，句子表原因，doing在句尾表结果时，无逻辑主语，在doing前可加therefore等

C，过去分词在句末：优先做定语修饰就近名词

D，介词in addition to/in/by/without+doing放句首时，逻主等于主句主语，放句末时，可能等于也可能不等于主句主语

欢迎继续补充