Option 1 -> propensity means a natural tendency or inclination, which doesn't fit predictions about world events.
Option 2 -> proposition refers to a statement or proposal, but isn't the right term for future predictions.
Option 3 -> perception means one's interpretation or view of something, not a prediction about the future.
Option 4 -> prophecy means a prediction about future events, perfectly fitting astrologers' predictions about world destruction.
Hence, Option 4: prophecy -> Prophecy is the correct term for predictions or foretelling of future events, especially those made by people claiming special knowledge or divine inspiration, which aligns perfectly with astrologers making claims about the world's destruction -> correct