Answer: The Correct answer to your question is B. Writing the first rough version of the story.
Explanation: The act of Drafting can simply be termed as the act of creating multiple rough copies of content which develops into a complete and perfect form at the end. The idea of drafting is to develop raw content into a presentable format at its perfection.
In our case, Dalir is in his drafting phase of writing a story which simply means that he is writing multiple copies of the same story, improving its quality as he progresses from one draft to another. Dalir's motive is to make his story perfect and presentable and he starts it off by writing the first rough version of the story, which is the core idea of drafting itself.