hard · LSAT Logical Reasoning
The journal will retract an article if its central result is unreproducible and the failure cannot be explained by a documented difference in materials. Two laboratories failed to reproduce Article P's result. Their reagent came from a different supplier, but the article lists purity specifications rather than a supplier. Tests show both suppliers' reagents met those specifications. The editor concludes that P will be retracted.
Which one of the following, if assumed, enables the conclusion to be properly drawn?
- Any unreproducible central result requires retraction, and reagent purity was the result's only relevant variable.
- Two independent failures establish central-result unreproducibility, and no documented material difference explains them.
- Both laboratories used reagents from the same supplier as one another.
- The supplier difference was not documented in the article, and the two laboratories followed the same protocol.
- A central result is unreproducible when two laboratories using the same production batch fail, and same-specification reagents count as one batch.
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