How to make a game object destroy multiple gameobjects one per trigger enter 3d,How to make an object destroy objects once per enter with trigger enter 3d

I figured out a way to make a game object destroy multiple objects at the same time. I Don't want that, I want it where a game object enters that trigger area the boxes get destroyed one per enter,like when a game object enters that trigger area each time only one box gets destroyed per enter. Please help thanks. I am using c#sharp btw. ,I figured out a way when an object enters a trigger all of the boxes in that trigger area, are destroyed at the same time. I don't want that, I want it where an object enters that trigger area one box is destroyed per enter, Please help thanks. I am using c#sharp btw.