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Verbal·Standard English Conventions·Boundaries

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With one in Canada and another in Antarctica, the observatory sites that form the Super Dual Auroral Radar __________ or SuperDARN, as space physicists like Pavlo Ponomarenko call it—number nearly five dozen. Located across the globe, the radars track geomagnetic storms and other geospace phenomena.

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

A

Network—

B

Network,

C

Network:

D

Network