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The use of headlights is necessary

  1. during the day and night.

  2. at night and during inclement weather.

  3. only during the day.

  4. only at night.

The correct answer is: at night and during inclement weather.

The use of headlights is necessary not just for nighttime driving, but also during inclement weather such as heavy rain, snow, or fog. This is because these conditions can reduce visibility and make it difficult for other drivers to see your vehicle. Therefore, it is crucial to use your headlights to ensure your own safety and the safety of others on the road. Option C, stating that headlights are only necessary during the day, is incorrect because there may be rain or fog during the day that requires the use of headlights. Option D, stating that headlights are only necessary at night, is also incorrect because inclement weather can occur at night as well. Option A is too broad and does not specify any specific conditions where using headlights is necessary, making it less accurate than option B.