D is not correct for the first answer, re-read the question, it is about Galileo. C for the second is not correct either, the speed of light is only c in inertial reference frames."D" and "C", respectively. One of the two postulates of special relativity is that the laws of physics are identical for all inertial frames of reference.
For the second one, the speed of light (in a vacuum) is always "c". There is nothing you can do to measure it to be any different (short of using a medium with a higher index of refraction).