The correct answer is D. Yael gives details in chronological order, which supports her central idea by showing development.
Step-by-step explanation:
In the excerpt presented, Yael provides information about the development of folktales, for doing this she first states folktales were transmitted orally but later this changed due to the development of technology. After this, Yael adds details in chronological order related to this idea as she states before 1450 folktales were orally transmitted but wit the invention of press they became documents and books. This means the details provided by Yael effectively explain the central idea and these details are organized chronologically or according to time (Option D).