The poet's notebook ______ filled with cross-outs, marginal notes, and coffee stains ______ revealed the painstaking process behind her seemingly effortless verse.
Which choice completes the text so that it conforms to the conventions of Standard English?
- A
, ,
- B
, —
- Ccheck_circle
—, —
- D
—,
Explanation
A pair of em-dashes properly sets off a parenthetical with internal commas, providing emphasis and clarity. Commas alone would create confusion with the internal commas, and mismatched punctuation is ungrammatical.