Which approach to a read-aloud activity would best develop four-year-olds' understanding of fact and opinion?

The approach that involves helping children articulate one thing they learned from a nonfiction text effectively fosters four-year-olds' understanding of fact and opinion. This method encourages engagement with the material on a deeper level. By focusing on nonfiction, children interact with factual information, which helps them distinguish between facts—statements that can be verified—and opinions, which are subjective and can vary between individuals.

Through this activity, children practice recognition of factual statements within a text, reinforcing their comprehension skills and their ability to discern factual information from personal viewpoints. As they discuss what they have learned, they gain experience in expressing their understanding of content, further solidifying their grasp of the difference between an objective truth and a subjective opinion.

The other options, while valuable for developing critical thinking skills, do not directly target the objective of understanding fact versus opinion in a way that is as accessible and developmentally appropriate for four-year-olds.