GMAT Verbal Reasoning Practice Test 7

Question : 39 of 100

Marks: +1, -0

Ecologist: We do not know how many species are facing extinction, because so many species are undiscovered. If the members of these undiscovered species were plentiful and widespread, they would most likely already have been discovered. And the best predictor of high extinction risk for a species is low numbers coupled with limited habitat. Thus it stands to reason that _____________.
Which of the following most logically completes the argument above?

a greater number of undiscovered species than discovered species are at high risk of extinction
the reason so many species have not yet been discovered is that they are facing extinction
restoring the habitats of known species in order to protect them from extinction also protects undiscovered species from extinction
many undiscovered species are likely to face a high risk of extinction
most undiscovered species will become extinct before we can discover them

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