Critical Reasoning

Years ago, some in the government's intelligence community feared the work of telecommunications researchers at then-emerging private security firms. The government experts concluded that these private firms posed the biggest risk to successful government espionage. As the private security firms began publicly releasing and advertising encryption algorithms and other security products, these government experts saw support for their conclusion when an encryption algorithm that government experts could not break began appearing in countless emails.
Which of the following, if true, most weakens the conclusion of the government experts referred to above?
A) Shortly before the government experts reached their conclusions, two private security companies each claimed to have developed "the world's strongest email encryption algorithm"
B) The private security firms' decision to advertise their products and sell them publicly led to other members of the private sector and academia scrutinizing the encryption algorithms.
C) An open-source encryption algorithm, developed by an academic and freely available from popular websites, is recognized by numerous ex-government code breakers as the most unbreakable algorithm ever developed.
D) An enemy government recently succeeded in placing a spy within the government espionage operations referred to above.
E) To strengthen the reputation of the private security firms, employees of these firms publish information about the strength of their products and the benefits of using them.


What is the answer ? And why ?
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