Final answer:
Expertise and trustworthiness are critical in focusing on source credibility, as proposed by Herbert Kelman. Credible sources are generally more persuasive and reliable for research purposes.Hence, the correct answer is option B.
Step-by-step explanation:
Expertise and trustworthiness are very important when focusing on source credibility, which is one of the categories of source attributes developed by Herbert Kelman. When evaluating sources for your research, considering the credibility of a speaker or author is crucial. This includes assessing their expertise, trustworthiness, and bias. Speakers who are credible or have expertise on the topic and who are deemed as trustworthy are more persuasive than less credible speakers. Hence, credible authors with a solid academic association are often more reliable, as their work typically reflects a compilation of well-researched studies.