______ , the manuscript was sent to three external reviewers for independent evaluation.
Which choice completes the text so that it conforms to the conventions of Standard English?
- A
After thoroughly editing the draft
- B
Editing the draft thoroughly
- C
Having edited the draft thoroughly
- Dcheck_circle
Once the editor had edited the draft thoroughly
Explanation
Only choice 2 supplies a clear subject ("the editor") for the editing action. The other choices dangle: a manuscript can't edit itself.