Thanks - have checked.
Looks like you only get options 3 and 4 if you don't already have dinosaurs in the nation. These are options for a non-dinosaur nation to decide the style of how they introduce dinosaurs to the nation.
If dinos are already present, you're just making a decision as to whether you are allowing Jurassic Park or not.
Not sure I would have structured this issue that way myself, but I can see the sorta logic to it. Not something I'm going to edit/change.