Tamar is conducting research on the benefits of owning a pet. One source provided statistics but also focused on the author’s experience of pet ownership. Tamar feels confident that the source is trustworthy but wants to be sure. Which step can Tamar take to confirm the source’s objectivity?

conduct more research on pet ownership
compare the author’s previous work to their current work
contact the author for more information
confirm that the author’s writing reflects multiple viewpoints