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Verbal·Standard English Conventions·Boundaries

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With one in Finland and another in Australia, the observatory sites that form the Super Dual Auroral Radar Network—or SuperDARN, as space physicists like Mark Lester call it—number nearly five        across the globe, the radars track ionospheric irregularities and other geospace phenomena.

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

A

dozen. Located

B

dozen, located

C

dozen, which are located

D

dozen located