Well, I think it would depend... I would say it's B. since if it's a popular author, people must know that person as being a certain way, such as if they are credible, or they are a satire source. It could technically be date too, but I feel like it's more logically to go with B. the popularity of the author.
To judge a sources legitimacy is to find factual evidence on a page. Does the page use sources as well? Does the source come from a domain such as: .edu .gov etc.? Does the author show non opinions? If the answer to these questions is yes then your credible resource is accurate.
