What phrase justifies why the theory of evolution is a theory and not a law? a. describes the relationship between organisms and it's environment b. makes accurate predictions about the occurrence of natural events c. explains diversity based on the principles of natural selection d. can i to be modified it with the discovery of new evidence

It's D. It can be modified with the discovery of new evidence. 
People won't believe it's true until it is completely confirmed and you still will have people with doubts about it. It also can not be accurately expressed as true due to human imperfection and mistakes, making things you find could be untrue. Life is always changing so when it comes to determining life, everything is just a theory. A GAME THEORY! (i am so sorry) 

Id so