The correct answer is: B. Amber
Amber is the most common color for hazard lights, also known as flashers. They are used to warn other drivers of a hazard on the road, such as a stopped vehicle or a construction zone. Amber lights are also used on emergency vehicles, such as police cars and ambulances.
Red is the color of stoplights and stop signs. It is also used on the rear of vehicles to indicate that they are braking. Green is the color of traffic lights and traffic signals. It is also used on the front of vehicles to indicate that they are turning left.
None of these is the correct answer because it is not a color.