As scientists have learned more about atoms, models of atoms have changed. One of the first atomic models was a solid ball, such as a marble. What are two limitations of using a marble to model an atom?

A. the model does not move or behave like a real atom.

B. the model is not made of commonly available materials or objects.

C. the model does not show the true size of an atom.

D. the model is much harder to see than a real atom.