The architect's design ______ bold, sweeping, and unconventional ______ transformed the city's skyline.
Which choice completes the text so that it conforms to the conventions of Standard English?
- Acheck_circle
—, —
- B
, —
- C
—,
- D
, ,
Explanation
A pair of em-dashes properly sets off a parenthetical containing internal commas. Commas alone might confuse the reader given the internal commas, and unmatched dashes are ungrammatical.