How to control actor blueprints in level blueprints

I have 5 class blueprints of different objects. i set questions to every objects. if user clicks on correct answer then that object should not display again and then 2nd object should come on viewport. how to do this all in level blueprint for my all 5 objects?

If you select your actors in the level, then go to your level blueprint and right click, you can add a reference to your actors in the level blueprint. From there you can execute any function on them that you need.