Answer:
the correct answer is D
Explanation:
When the star explodes the radiation travels through empty space at the speed of light c= 3 10⁸ m/s
This speed has been experimentally proven to be constant, therefore two two instruments arrive at the same time
Therefore the correct answer is D
D. There's not enough research surrounding it. A big question is if they have side effects due to genetic modification that we don't know of.
(Not sure if you had D eliminated or? But it should be the correct answer)