Final answer:
A scholarly journal is most likely to contain rigorously peer-reviewed content and is considered the gold standard for academic research.
Step-by-step explanation:
The source most likely to contain rigorously peer-reviewed content is a scholarly journal. Scholarly journals are academic publications that often contain specialized information and vocabulary relating to a specific field of research. Articles published in these journals are written by experts and undergo a process called peer review, where other experts in the field evaluate the work for its accuracy and contribution to the discipline prior to publication. Therefore, they are considered the gold standard of research and tend to provide strong evidence supported by rigorous research. In contrast, blog posts, newspaper articles, and Wikipedia pages do not typically go through the same rigorous peer-review process and may not be as reliable for academic research.