The correct statement is:
The U.S. is the fourth-largest nation in the world by area, the third-largest by population, and has the highest Gross Domestic Product of any country on earth.
To clarify:
- The U.S. is approximately the fourth-largest country by area, after Russia, Canada, and China.
- It is the third-largest country by population, following China and India.
- The U.S. has the highest Gross Domestic Product (GDP) of any country in the world.