Here's a problem to solve: 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?

Among the 4 following options, which is the correct answer?

- A: It is replaced.
 
- B: It is modified.
 
- C: It becomes law.
 
- D: It becomes suspect.
 