Answer:
The correct answer is - C. Rich countries.
Explanation:
In 2017, if any country has a per capita income of US$ 12,056 annually or above is considered as a high-income country. Such countries are also called first-world countries, developed or rich countries.
On other hand, countries with US$ 955 or less per capita income or less are called low-income countries. The USA is a rich or developed country as it has more per capita income than US$ 12,056.