I believe it's 3, parenthetical expression
The question ask to choose among the choices the correct answer where as states the three ways you can weave research into a paper and the best answer would be letter D. quotation, paraphrase or summary. I hope you are satisfied with my answer
3.)3. Foreshadowing hints to readers that something is of significance and gets them interested.
4. Exposition helps readers understand the background of the story
