At night, when you approach an oncoming vehicle, you should:

• A. Put your lights on high beam, to make your vehicle more easily seen.
• B. Not look at its headlights, but keep left and watch the left of the road.
  Explanation:

  "Looking at the left of the road will allow you to judge where you are without being dazzled by the oncoming vehicle's lights."
• C. Carefully watch the vehicle by looking directly at its headlights.