Acountry can charge fees for economic activity that occurs within a(n) a. atoll b. duty-free zone c. geothermal plateau d. exclusive economic zone

The correct answer is D. Exclusive economic zone.
Every country can charge fees according to it's legislation. When talking about charges about economic activities, then exclusive economic zones are in the legislation range of most of the countries in the world, and this is were the economic activities take place for the most part. Duty-free zone is a zone where you can not be charged, while on a geothermal plateau or on an atoll is almost impossible to have any economic activity.

Nation of conflicting ethnic groups