The photograph Earthrise, taken by astronaut William Anders during the Apollo 8 mission in ______ shows a blue-and-white Earth rising above the Moon's gray, barren horizon.
Which choice completes the text so that it conforms to the conventions of Standard English?
1968
1968;
1968—
1968,
Answer: D
The phrase "taken by astronaut William Anders during the Apollo 8 mission in 1968" interrupts the subject (the photograph) and the verb "shows." It opens with a comma, so it must close with a comma.
Choice C uses a dash, but an interruption that opens with a comma must close with a comma.
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