Even though she thought the informant was untrustworthy, the journalist promised not to reveal his identity so long as the information he provided did not turn out to be false.
However, she will publicly reveal the informant's identity if she is ordered to do so by a judge or her editor.(premise) After all, the information concerns safety violations at the power plant.
Thus, the journalist will surely reveal the informant's identity even if the information is accurate. (conculsion)
The conclusion of the argument follows logically if which one of the following is assumed?
(A) The information that the informant provided is known to be false. - Conclusion clearly states that Journalist will reveal the Identity even if the info is accurate - Out
(B) The journalist's editor will not order her to reveal the informant's identity unless the information is accurate and concerns public safety. -- Conclusion already states even if Info is correct identity will revealed -- Out
(C) If the information concerns safety at the power plant, a judge will order the journalist to reveal her informant's identity. -- This explains why Judge would order -- Supports the conclusion
(D) The truth of the information provided by the informant can be verified only if the informant's identity is publicly revealed. -- Argument already establish that identity will be revealed even if the information is accurate - Out
(E) The informant understood, at the time the journalist promised him confidentiality, that she would break this promise if ordered to do so by a judge. - Out of scope --