The choices for your question are:
a. It has been proven as a fact.
b. It has been changed over time.
c. It predicts but does not explain.
d. It has stayed the same for a long time.
The main reason why the scientific model of atoms is considered a theory rather than a law is because it predicts but does not explain. The answer to your question is C. I hope that this is the answer that you were looking for and it has helped you.