The Hubble Space Telescope ______ launched in 1990, has provided some of the most detailed images of distant galaxies ever captured.
Which choice completes the text so that it conforms to the conventions of Standard English?
- A
;
- Bcheck_circle
,
- C
(empty)
- D
:
Explanation
"Launched in 1990" is a nonrestrictive participial phrase set off by paired commas. The closing comma already exists, so the opening comma is needed.