The speed of light relative to its source is light moves at the same speed independent of the motion of the source. Option B.
The Special Theory of Relativity is based on Einstein's discovery that the speed of light does not change as the light source moves. It may seem logical to add the speed of the light source and the speed of the ray to determine the overall speed, but light doesn't work that way.
The speed of light is constant for everything. What Newton, and later Einstein, showed was that there was no underlying frame of reference. All movements are relative. Light differs only in that everyone perceives it at the same relative speed. The speed of light is independent of the movement of the observer. The speed of light does not change with time or place.
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