Correct answer
It reflects received light towards its source without producing light itself.
It returns part of the light received towards its source without producing light itself. It is a reflective optical-signalling device, not a lamp lighting the road. Colour, shape and mandatory use depend on position and vehicle category under the General Vehicle Regulations. For example, rear reflectors are red and triangular ones identify trailers and semi-trailers. It does not replace headlights or other required lamps.
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It produces its own white light using a bulb.
It reflects received light towards its source without producing light itself.
It replaces dipped-beam headlights at night.
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Glossary terms in this question
Reflector (catadioptric)
Passive reflective device that bounces incoming light back toward its source so it can be seen in the dark.
Semi-trailer
Trailer without a front axle, coupled to a tractor unit so part of its weight rests on the tractor.
Dipped-beam headlights (low beams)
Short-range front lights that illuminate the road without dazzling other drivers.
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