An explanatory thesis typically explains or clarifies a topic without taking a strong stance or argument on it. Among the options provided, the thesis that best fits this definition is:
"Reality TV and sitcoms are favorite forms of entertainment that stir up the emotions of viewers, both positive and negative."
This statement simply presents a fact about reality TV and sitcoms and their impact on viewers’ emotions without arguing for one being better or worse than the other. It serves to explain the emotional engagement of viewers with these two forms of entertainment.