If you see someone fall through thin ice on a frozen lake or pond, what is the safest immediate action for you to take?

✓ Correct Answer: Option B

Running onto thin ice puts your own life at risk. The safest approach is to first call for professional help and then, if possible and safe to do so from shore or a very stable surface, extend a long object to the person without going onto the ice yourself. This aligns with the "Reach or Throw, Don't Go" principle.