Create two dynamic select lists
You can take a look at the Taxonomy menu module. Some details about it (from its project page):


  Transforms your taxonomy vocabularies into menus with ease!
  
  
  Custom Menu per vocabulary
  Uses the default taxonomy term path or custom paths
  Integrate with Views
  Integrate with Pathauto: use URL/path aliases
  Does not interfere with other menu modules
  


Also look at this post:

How do I direct link a view to a taxonomy menu?