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Verbal·Standard English Conventions·Boundaries

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In 2022, Frank Condori, who studies amphibians, joined a research team for a 38-day expedition to the remote yet populous region of Alto Mayo, Peru. It had long been assumed that regions with large human __________ were unlikely to yield discoveries of new species, but team members found 27 such species, including a new species of tropical climbing salamander.

Which choice completes the text so that it conforms to the conventions of Standard English?

A

populations which

B

populations

C

populations, which

D

populations;