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Question:

Which of these statements is true about warning other drivers of your stopped vehicle?

A Move the rear reflective triangle back if the driver's vision is obscured to within 500 feet.
Explaination

Other drivers should be able to see your stopped vehicle or its warning devices from at least 500 feet away in either direction. If your vehicle is obscured by a hill or curve, set out a warning device up to 500 feet behind your vehicle.