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This is a single-blank Text Completion item testing vocabulary-in-context and critical reading. The sentence presents a claim: short breaks → higher productivity. It then introduces a limitation: the study used self-reported productivity. Self-reports can introduce bias (social desirability, memory errors, or motivated reasoning). The logical consequence is that the conclusion might not be fully warranted yet. “Premature” best captures “drawn too soon given limited evidence,” aligning with GRE Verbal objectives to evaluate claims given methodological constraints. “Unimpeachable” (beyond reproach) contradicts the caveat. “Exhaustive” means comprehensive, which doesn’t match the warning. “Superfluous” means unnecessary or excessive; a conclusion can be unnecessary, but the sentence suggests a timing/justification issue rather than redundancy. Thus “premature” fits both meaning and tone. On the GRE, when a second clause signals limitation (often introduced by “however,” “although,” or “but”), look for an option that reflects caution or undermines certainty appropriately. The test assesses your ability to reconcile claim and qualifier, choosing a word that preserves coherence and accurately reflects the author’s stance toward the evidence quality.