The correct answer is B) to be sure the point is clearly made.
The main purpose of the draft revision is to be sure the point is clearly made.
This is the draft; Gandhi went on a hunger strike for peace.
This is the revision; Gandhi went on public, the three-week hunger strike opposing factions.
As we can see, the revision includes more specific details in order to allow the reader to clearly understand the point. So it is very important to be concise in your writing, and specific enough, including the important details that give meaning to a sentence.