The correct answer is omen.
The correct answer is (D) An omen; an indication or sign of something about to happen, esp. something momentous; a warning about an important future happening; a sign of ominous significance.
Portent comes from Latin portendere (to portend, predict)
Examples of use:
- The portent hung over him and diminished his delight with the gift.
- News of the accident was received an occurrence of dire portent.