Select the correct answer. Read the excerpt from "The Tell-Tale Heart" by Edgar Allan Poe.

Hearken! and observe how healthily — how calmly I can tell you the whole story.
It is impossible to say how first the idea entered my brain; but once conceived, it haunted me day and night. Object there was none. Passion there was none. I loved the old man. He had never wronged me. He had never given me insult. For his gold I had no desire.

Which literary technique is used in the excerpt?

A. flash forward
B. symbolism
C. flashback
D. foreshadowing