The correct answer is D. Evaluate the sources and see if the authors are biased.
Step-by-step explanation:
Credibility refers to whether the reader can trust and/or believed the information presented in a source. In general terms, credibility is linked to the reputation of the author, which implies if the author is an expert in the subject the source is more likely to be credible; also, credibility is related to the evidence that the author uses to support the ideas presented in the source and whether the author is biased, this implies the information is not objective but guide by the author personal prejudices, which makes it one-sided or lacking a neutral viewpoint and thus, information cannot be believed. Because of this, one way to determine if the source is credible is by analyzing and evaluation if the author is biased or supporting one side guided by prejudices.