Answer:
a. he consults well-known, credible sources in his research.
Explanation:
The attempt to be objective is trying to search for as many sources as possible, experts in the matter and trying to portray both sides of the story, this way objectiveness can be achieved, by writting and consulting credible well-known sources is part of that job.
They basically had the same motive which was to contain communism
was murdered during the early morning on 30 December [O.S. 17 December] 1916 at the home of Felix Yusupov. He died of three gunshot wounds, one of which was a close-range shot to his forehead.