He was known for his writing skills.
The correct option is B.
The source of information, that would offer the most reliable fact-based information about the author is a book, that is written by the author himself. This type of source is called primary source. Information obtained from Wikipedia, movie and books published by other authors can only offer secondary information, which are not as reliable as information from primary source.
Answer:
a person who has or represents authority.
Explanation:
the power or right to give orders, make decisions, and enforce obedience.
Subject: "Each of the staff members"
Verb: "take a training course in the new software."
