Sometimes it's important to state the obvious. Community Enterprise (our software platform) supports responsive design.
Responsive design is a term thrown around by tech consultants, but mainly it just means that a web site will scale down smoothly and display well in mobile browsers (e.g. in smart phones and tablets). That's it.
Responsive design is easy to do and any good content management system will support it, including ours. There is no magic to it. In fact, there are many good design frameworks to make it easy. We have many client sites that use the Bootstrap and Skeleton responsive design frameworks.
So, if you are using this platform and someone asks you if it can support responsive design themes, the answer is yes.
I hope that helps!