medium · GMAT Verbal
A wildlife researcher claims: "The number of sightings of bald eagles in this area has tripled over the last year. It follows that the local ecosystem is recovering."
What logical role does the first sentence play in the researcher's argument?
- It is the main conclusion that the researcher's whole argument is meant to establish.
- It is an unstated assumption made about the underlying bald eagle population size.
- It is a counterexample that the researcher first raises and then proceeds to dismiss.
- It is incidental background context that has no direct bearing on the argument's logic.
- It is the premise that supplies observational evidence for the claimed recovery.
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