The answer is B. It is like giving an overview of the story without going into too much detail, and it shouldn't include your opinion. It should simply summarize the information included in the story.
I just took the test and it is a, not b!
Please give more information, what is the part A question, what your answer was and your answer options
B- you choose your topic on based purpose. If you purpose is to educate your topic would be different then if you
want to entertain your audience.