It is replaced. It is modified. It becomes law. It becomes suspect.
I gave my students this multiple choice question: There are several theories that exist concerning the way dinosaurs became extinct. If new evidence is found that appears to challenge a particular theory on dinosaur extinction, what happens to the old theory?

Only one answer is correct among these 4 choices:
- It is replaced.
- It is modified.
- It becomes law.
- It becomes suspect.

Could you tell me which one is correct?

It is modified.