Answer:
D. It will become a law when enough evidence is supported.
Explanation:
Based on observations of natural phenomenon, a possible scientific explanation is written and tested. If the results are positive, it becomes a theory. If enough evidence is gathered and can be used generally, it becomes a law. For example Newton's laws of motion are used to describe all kinds of motion on Earth.
Einstein's theory of relativity cannot be tested directly but it's indirect evidence can be gathered because it deals with speeds near to the speed of light and space-time curve.
Thus, when the scientists would gather more evidence in future supporting Einstein's theory of relativity, it would be converted to law.
Option D. is correct.
