The author doesn't offer facts, statistics, or specific examples, but uses vague statements and sweeping generalizations is an indicator that a source may not be accurate.
Answer: Option B
Explanation:
Obviously, it is very important for the author to also mention from where the details are obtained so that they can be referred or checked in case there is a need to verify the same. While verifying is secondary, inclusion is something which can be interpreted.
Such that the author has done enough research to make a claim through the data being used and point being made. Through the addition of facts, statistics and specific examples, the author establishes credibility and accuracy in the statements being made.