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Verbal·Standard English Conventions·Boundaries

hard

The radial velocity method, a means of indirect planetary discovery, has detected previously unknown exoplanets at vast distances from __________ the Neptune-like planet DMPP-1 b; at 296 light-years away, the gas giant 42 Draconis b; and, as of 2023, over 1,000 other exoplanets that are too far away and dim to be observed directly.

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

A

Earth, at 204 light-years away,

B

Earth at 204 light-years away,

C

Earth at 204 light-years away:

D

Earth: at 204 light-years away,