Final answer:
The most credible source for an essay on the causes, effects, and risks of concussions in sports would be an article analyzing research studies on sports-related concussions from a peer-reviewed journal.
Step-by-step explanation:
The most credible source for an essay on the causes, effects, and risks of concussions in sports would be option c) An article analyzing research studies on sports-related concussions from an athletic training profession peer-reviewed journal.
Peer-reviewed journals are highly respected in the academic community as the articles they publish undergo a rigorous review process by experts in the field. This ensures that the information presented is credible, accurate, and reliable. Therefore, an article from a peer-reviewed journal would provide in-depth analysis and insights based on scientific research and would be the most appropriate source for an essay on this topic.
Additionally, the journal article option also aligns with the paragraph provided, which mentions that researchers have looked at the relationship between helmet safety ratings and concussions, indicating the importance of research studies in understanding concussions in sports.