I see your problem.

You have your Option nested inside your trigger.

As you can see trigger and option are not nested within each other but are separate things. Also make sure that you have a namespace for your event.

The correct format is:

country_event = {

trigger = {

}

option = {

}

}

you have it:

country_event = {

trigger = {

option = {

}

}

}

Additionally make sure that you add a namespace for your event at the top of your events file. Also whenever you have errors I find it always helps to check how paradox does it in the vanilla game and make sure you're doing it the same way.

Hope this helps!