Einstein's theory of relativity is currently the best explanation of gravity. What is likely to happen to this theory in the future?

A.It will be replaced by a new theory when popular opinion changes.
B.It will become a law when there is consensus among scientists
C.It will be replaced by a new theory when enough evidence is collected
D.It will become a law when enough evidence is supported

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.