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The speed of light is constant in a vacuum.
The speed of light is constant in all inertial reference frames.
Zeraph, in your example each of A B and C is an inertial reference frame. Time and space in one frame as viewed from any other frame is relative to the velocity of the other frame. Even if, relative to B, the sum of the velocities of A and C is greater than the speed of light, viewed from either of those frames, the velocities of the other frames WILL be less than the speed of light. This seems like a paradox but the way you can look at it is that time and space warp to prevent anything from moving faster than light, in special relativity this is known as time dilation (special relativity does not really get into the case of space warping but it can happen). Basically time slows down for the moving observer relative to the observed frame which causes the relative velocity to be less than the speed of light in any case.
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"Prohibition will work great injury to the cause of temperance. It is a species of intemperance within itself, for it goes beyond the bounds of reason in that it attempts to control a man's appetite by legislation, and makes a crime out of things that are not crimes. A Prohibition law strikes a blow at the very principles upon which our government was founded." --Abraham Lincoln
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