Which of the following websites provides access to peer-reviewed articles for free?

The choice of https://core.ac.uk as a source for free access to peer-reviewed articles is valid because CORE is a service that aggregates open access research outputs from repositories and journals worldwide. It provides users with the ability to search through millions of research papers in various disciplines, ensuring that they have access to high-quality, peer-reviewed materials without any cost. This commitment to open access aligns with the increasing demand for accessible academic resources, making it a fitting choice for those seeking free scholarly articles.

While other platforms also provide access to academic papers, they may have restrictions on certain content or require institutional access. For example, JSTOR primarily operates on a subscription model, and while it offers some free content, many articles are behind paywalls. ScienceOpen and ERIC also have valuable resources but may not provide the same extensive free access to a wide array of peer-reviewed articles as CORE does.