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Which one of the following, if allof them are true, is LEAST helpful in establishing that the conclusion above is properly drawn?
According to GMAT CR Bible by Powersocre, the question above is asking "Strengthen"
Why not "evaluate"?
With this kind of question, you have to find the strengthened answers and then eliminate them. Evaluating question is different field, in this kind of question, the answer statement will help you recognize what role the answer (of the question in the answer) is, strengthen or weaken the argument.