请教GWD-12-Q34

GWD-12-Q34:

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