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Verbal·Standard English Conventions·Boundaries

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With one in Finland and another in Japan, the observatory sites that form the Super Dual Auroral Radar        as space physicists like Tadahiko Ogawa call it, number nearly five dozen. Located across the globe, the radars track gravity waves 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: