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Verbal·Standard English Conventions·Form, Structure, and Sense

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While some biologists cite the Darwinian species concept (Jolly 2014), others adhere to the evolutionary species concept (Barraclough 2019), with at least fourteen other concepts used across the field. Such lack of consensus, however, isn’t necessarily cause for alarm. Scholars supporting a pluralist approach—in place of a single, monistic concept—to defining a species __________ that a diversity of species concepts fits their equally diverse applications throughout the discipline.

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

A

to argue

B

is arguing

C

argue

D

argues