If you are blinded by the glare of headlights from another car at night, what should you do?

Answer: C — Reduce your speed

When you are blinded by the glare of headlights from another vehicle at night, reducing your speed is the safest response. Slowing down allows you to maintain better control of your vehicle and gives you more time to react once your vision is restored. It also helps to prevent accidents as you navigate through conditions where visibility is compromised. Switching to low beams can be a helpful technique in general, but it does not apply in this situation since the other driver's high beams are the issue. Honking your horn may notify the other driver, but it doesn't address your immediate visibility problem while driving. Pulling over immediately is too abrupt and could create an unsafe situation, especially if done in a place where the vehicle could be struck by oncoming traffic. The best course of action is always to slow down and drive cautiously until you can see clearly again.