Converting object to string JQuery/JS/HTML

Question

I am trying to append a list of countries to my select tag, but whatever I try it keeps showing as [object Object]. Here is my JS code:

I've tried var x = JSON.Stringify(country); and passing that into var o, and I've also tried country.toLocaleString('en-US); and that has not worked either. How can I have the countries show in the select list? Thanks