The graphs of ABC, B^3D, and C^2D are shown.
What combination of letters would make the graph of the dotted line?
![The graphs of ABC B3D and C2D are shown What combination of letters would make the graph of the dotted line class=](https://us-static.z-dn.net/files/dce/970c2ff25f8abe55751af84e54e0c1ba.png)