PLEASE HELP!

Question

Which of the following accurately states the claim of special relativity with respect to the speed of light?
A. The speed of light in a vacuum is faster for frames of reference that have a constant velocity.

B. The speed of light in a vacuum is slower for accelerating frames of reference.

C. The speed of light in a vacuum is the same for all frames of reference.

D. The speed of light in a vacuum is the same for stationary frames of reference.

Answer 1

The amazing realization of Einstein and the starting point for his work is:

C. The speed of light in a vacuum is the same for all frames of reference.