Respuesta :
Answer:
Option A, The speed of light is an untested theory.
Explanation:
The speed of light has special mention in the theory of relativity which has a basic postulate that light travel with same speed in all frames of inertia. This postulate actually has two major parts- a) speed of light is not affected by the speed of observer and b) Speed of light is a quantity that do not vary with time and place.
Hence, of all the theories till date it is said that any thing which reaches the speed of light is no more a measurable quantity
Hence, option A is correct.