Bunuel
Political theorist: For all of its members to be strong in foreign policy, an alliance of countries must respond aggressively to problems. An alliance will do so only if every member of the alliance perceives the problems as grave. But the European Union countries will not all perceive a problem as grave unless they all agree that it threatens their alliance's economy. Thus, not all of the member countries of the European Union will be strong in foreign policy.
The conclusion drawn above follows logically if which one of the following is assumed?
(A) Countries that refuse to join alliances generally respond more aggressively to problems than do countries that do join alliances.
(B) Countries become less aggressive in foreign policy if greater wealth leads them to think that they have more to lose by responding to problems aggressively.
(C) Problems that appear to some member countries of the European Union to threaten the alliance's economy will not appear so to others.
(D) European Union member countries that fail to perceive the economic relevance of problems are generally weak in foreign policy.
(E) Alliances that are economically beneficial for a given country are not necessarily beneficial with regard to foreign policy.
EXPLANATION FROM POWER PREP
In this stimulus, the political theorist presents a series of conditional statements, which can be diagrammed as follows:
For an alliance to be strong, it must respond aggressively to problems:
An alliance will respond aggressively only if every member perceived gravity:
But the EU countries will not perceive a problem to be grave unless they all agree that it threatens their alliance’s economy:
What we then have is the following chain of logic:
AS --> RA --> PG --> ATAE
We can also draw from these statements the following contrapositive chain:
ATAE --> PG --> RA --> AS
The theorist concludes that, with respect to the European Union,
not all members of the will be strong in foreign policy (this is the condition ‘
AS’ diagrammed above). We are then asked to justify this conclusion. This means that from the answer choices we should select the one which, when added to the premises in the stimulus, allows for this conclusion (
AS) to be properly drawn.
Answer choice (A): This answer choice concerns an irrelevant group—those countries which refuse to join an alliance. Since this information does not affect the conditional reasoning in the stimulus, this answer choice is incorrect.
Answer choice (B): This choice supplies another condition, and relates to the aggression level of individual countries rather than the responses of alliances.
Answer choice (C): This is the correct answer choice. If problems that appear economically threatening to some countries do not appear so to others, then at least some countries do not perceive the gravity of the threat, meaning
PG (that is, not all countries in the alliance perceive the threat), and if we know this then we know
PG -->
RA -->
AS. In other words, from this information we can logically conclude
AS.
Answer choice (D): It does not matter which countries are weak, and this choice does not prove that any countries do fail to perceive economic relevance, so this choice does not trigger any of the conditions in the stimulus needed to justify the conclusion.
Answer choice (E): The benefits derived by individual countries from alliance membership are irrelevant to the conclusion we seek to justify.