To prepare for the simulated Mars mission ______ the crew lived for a full year in a sealed habitat in the Utah desert.
Which choice completes the text so that it conforms to the conventions of Standard English?
- A
:
- B
;
- Ccheck_circle
,
- D
(empty)
Explanation
The infinitive phrase "To prepare for the simulated Mars mission" introduces the main clause and is followed by a comma.