Scientists have been classifying living organisms for centuries. In the 1970s, organisms were classified in a five-kingdom classification scheme. However, two decades later, organisms called Archaebacteria were discovered. This led to a three-domain system of classification that combined some of the previous five-kingdom schemes. What does this change in classification methods demonstrate?

A.
Scientific theories can change as new evidence arises, but previous information is still useful.
B.
In order for new evidence to become laws, old theories must be discarded.
C.
In order for new evidence to become theory, it must prove that all other theories are wrong.
D.
Scientific theories that were proven at one time are no longer useful when new evidence arises.