Answer:
A personal story featured on an individual's blog
Explanation:
Option A would be considered credible, since it is tied to a university. Option C is also credible because it is an in-depth study that is promoted on a publicly-funded page. Option D is credible because the Wall Street Journal is recognized as a reliable news source. Since Option C is written by a private individual with no professional connections that may support their claims, they would be least credible.
