The dilemma

The studio lights are blinding. Millions of people will watch this when it airs. You've already won 250,000 and the host is waiting. You're 90% sure the answer is B, but if you're wrong, you drop all the way back to 32,000. No lifelines left. The host leans in. "So... is that your final answer?"

Your options

1. Lock it in. "Final answer."
2. Walk away with the 250,000. Not worth the risk.
3. Switch to C. Something about B suddenly scares you. Better safe than confident.