Answer:
B. Click the Next icon on the Reviewing toolbar to review and then accept or reject each edit.
Step-by-step explanation:
Since Jack wants to keep some changes and reject others, he can't use a global solution (like presented in answers A and C).
He has to go through each and every change proposition and decide individually if he wants to keep the change or not. That's why it's answer B.
It's the only way to accept some, reject some.
At the end of this process, he'll have a clean document with Rob's recommendations and his original documents.