You are driving at night with your headlights on high beam. When should you dip your headlights?

• A. When within 200 metres of an oncoming vehicle only
• B. When within 200 metres of the vehicle ahead or an oncoming one
  Explanation:

  "High beam headlights can dazzle other drivers and make it difficult for them to see the road and any dangers."
• C. Never, you are allowed to drive with your lights on high beam at all times.