Quote:
As one who has always believed that truth is our nation’s surest weapon in the propaganda war against our foes, I am distressed by reports of “disinformation” campaigns by American intelligence agents in Western Europe. In a disinformation campaign, untruths are disseminated through gullible local journalists in order to damage the interests of our enemies and protect our own. Those who defend this practice say that lying is necessary to counter Soviet disinformation campaigns aimed at damaging America’s political interests. These apologists contend that one must fight fire with fire. I would point out to the apologists that the fire department finds water more effective.
The author of the passage above bases his conclusion on which of the following?
(A) A circular definition of "disinformation"
(B) An example of the ineffectiveness of lying as a weapon in the propaganda war
(C) An analogy between truth and water
(D) An appeal to the authority of the fire department
(E) An attack on the character of American intelligence agents in Western Europe
Let us first understand what the question actually requires you to do. The question stem says, 'The author of the passage above bases his conclusion on which of the following?' Clearly, the conclusion is already part of the argument. You are to figure out the hidden premise or the assumption of the author. Now that you know you are dealing with an assumption question, you may work the argument by figuring out the conclusion and the premise.
CONCLUSION: I would point out to the apologists that the fire department finds water more effective.
PREMISE: In a disinformation campaign, untruths are disseminated through gullible local journalists in order to damage the interests of our enemies and protect our own. Those who defend this practice say that lying is necessary to counter Soviet disinformation campaigns aimed at damaging America’s political interests. These apologists contend that one must fight fire with fire.
In an assumption question, the right answer must bridge the gap between the conclusion and the premise. The premise talks of apologists who content one must fight fire with fire. Fire, clearly, means the practice of lying. However, the conclusion speaks of fire department and water. One can assume that water, on account of being found more effective by the fire department than fire itself, is somehow connected with the premise, for the author arrives at his conclusion based on the stated premise. Now, let us looking for a link that acts as an unstated premise in the given answer options. You shall eliminate answer options that are either out of scope or way too extreme to be correct.
(A) A circular definition of "disinformation" -
OUT OF SCOPE -
The argument has nothing to do with the circular definition of the word "disinformation" -
ELIMINATE(B) An example of the ineffectiveness of lying as a weapon in the propaganda war -
OUT OF SCOPE -
The author's conclusion speaks of fire department, which, as per the author, finds water more effective, meaning there is no example of the ineffectiveness of lying upon which the argument is based -
ELIMINATE(C) An analogy between truth and water -
BRIDGES THE GAP BETWEEN THE CONCLUSION AND THE PREMISE -
'Water' must have been used to mean 'truth', for if that was not the case, it is logically impossible to derive such a conclusion from the stated premise -
KEEP(D) An appeal to the authority of the fire department -
OUT OF SCOPE -
Not worried about any appeal -
ELIMINATE(E) An attack on the character of American intelligence agents in Western Europe -
OUT OF SCOPE -
Not worried about any attack on the character of American intelligence agents -
ELIMINATEHence, C is the right answer!