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Question:

At night, when you are within 1,000 feet of an oncoming vehicle or following another vehicle within 200 feet, you must

A use low-beam headlights.
Explaination

At night, when you are within 1,000 feet of an oncoming vehicle or following another vehicle within 200 feet, you must dim your headlights. High beams can distract the driver of the vehicle ahead of you because they can reflect off the vehicle's rear-view mirror. High beams can blind the driver of an oncoming vehicle.