Athird world country can be described as a(n) country.
a.
developing
b.
underdeveloped
c.
highly developed
d.
developed

First World countries are countries that are highly and fully developed, such as the United States.

Although you don't hear about them as much, "second world" countries are ones that are developing/for the most part developed.

Third World countries are countries that are underdeveloped. They have high levels of poverty and are not as technologically advanced.