I believe the correct answer would be A.
If an author is writing a news story, that implies that they would be sharing the details of an event/ facts (like in a news article). The author would want the reader to clearly understand what they are trying to make known.
B would be incorrect because it is not always necessary to include a lot of people. You really only need people who are relevant to the event. C would also be incorrect because a news story is not usually an opinion piece, it is just to relay information to others. The author’s personal opinion is not necessary and could distract from the factual information.