hard · GRE Verbal
Researchers studying soil inoculant observed that inoculated seedlings grew faster. They concluded that the inoculant accelerated growth. The result is suggestive, but those seedlings also received more sunlight; unless that possibility is addressed, the causal claim remains provisional. Which statement can be inferred from the passage?
- The observed change is consistent with the researchers’ explanation but does not by itself establish that explanation.
- The researchers’ proposed explanation has been conclusively disproved by the unresolved alternative and therefore can never explain the outcome in any population or setting.
- Every comparable study in other settings has independently produced precisely the same causal result.
- The alternative explanation identified by the author is certainly the sole cause of the observed change.
- The intervention is more effective than every competing policy that could address the same underlying problem.
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