Which option is a credible source?
Option A: An article published in a peer-reviewed scientific journal written by a renowned expert in the field.
Option B: A personal blog post written by an individual with no expertise or credentials in the subject matter.
Option C: An advertisement promoting a product or service related to the topic.
Option D: A social media post with no factual data or sources provided.
Option A is the most credible source out of the given options.