A warning or hint about something happening in the future of a story. A. Alliteration B. Flashback C. Foreshadowing D. Allegory

The answer to your question is c foreshadowing.

The literary device foreshadowing refers to the use of indicative word or phrases and hints that set the stage for a story to unfold and give the reader a hint of something that is going to happen without revealing the story or spoiling the suspense. Foreshadowing is used to suggest an upcoming outcome to the story.