When using the cars test to evaluate a source, which one of the following would indicate a lack of accuracy?

a. the writing is sub-par or contains errors.
b. the author doesn't offer facts, statistics, or specific examples, but uses vague statements and sweeping generalizations.
c. the author is using emotionally charged language and inappropriate words or employing a tone that reveals an obvious bias.
d. you're unable to find any other source that presents the same exact information or point of view.