Difficulty: Easy
Correct Answer: Precursor
Explanation:
Meaning
Harbinger = a person/thing that announces or signals the approach of another; a forerunner or precursor; a herald.
Option analysis
Precursor — direct synonym (forerunner/herald).Follower — the opposite in sequence.Afterthought — something considered later; unrelated.Precaution — preventive measure; unrelated to omen/forerunner.
Common pitfalls
“Harbinger” often has predictive sense; do not confuse with “harbor” (to shelter) due to similar spelling.
Final Answer
Precursor
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