Any solution will require the users to enable macros but should degrade gracefully if they don't (ie shows all sections).
However, I wouldn't recommend using Radio Buttons as they are legacy controls with security issues associated with their use. It would be better to make the level selection via a Dropdown Content Control and have a macro run based on the value of that CC.
Have a look at this thread where pretty much the same question was asked
https://www.msofficeforums.com/word-...ontrol-if.html