One of the side-effects of studying SC is that
I) You start seeing errors everywhere
II) You silently correct SC errors when you spot them.
1) A is sufficient for me
2) B is sufficient for me
3) A and B both are sufficient for me
4) Either A or B is sufficient for me
5) Are you mental? I don't do any such nonsense
Letting this thread run to see how it plays out.
Prephrasing, to me, is the last thing we should do for SC. My reasons are simple, there will always be one perfect
way to correct all the grammatical errors present in a sentence. The makers of the Test know that answer before we do, so, in all probability, we will never encounter that answer.
If you try doing that when you are going through OG, I can confidently say that there will be very few questions where the correct answer will be the perfect answer.
Obviously, it is a very good exercise, but will it help everyone? Depends.
If you have a 2 month time-frame to get your GMAT done and dusted, I doubt this strategy will work.
You can find errors everywhere, when you speak with others, when you read TOI, or, for that matter, even Edits of Hindu, when screened properly, will show up lots of errors. I will abstain from such an exercise !