Final answer:
The correct way to rewrite the sentence fragment is to place the subject, Colonel Chesnut, at the beginning of the sentence and include the fragment 'who had taken it all quietly enough' to provide additional information.
Step-by-step explanation:
The correct way to rewrite the sentence fragment is:
Colonel Chesnut, who had taken it all quietly enough.
This option correctly places the subject, Colonel Chesnut, at the beginning of the sentence. The fragment 'who had taken it all quietly enough' provides additional information about Colonel Chesnut.
Learn more about Rewriting sentence fragments