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Question:

In South Carolina, you must have your headlights turned on

A in all of the above situations.
Explaination

In South Carolina, you must use your headlights from half an hour after sunset to half an hour before sunrise. You must also use your headlights whenever visibility is poor at 500 feet and whenever you're using your windshield wipers continuously (not the intermittent "mist" setting) in poor weather. [Driving at Night, General Information, South Carolina Driver's Manual]