Andean region of South America has emerged as the world's most productive Copper Region
in the world.
Answer:

The unit of electric current that is equal to the flow of one Coulomb per second.
Ampere or ‘amp’ is a unit of electric current denoted by A. It is named after the French Physicist and Mathematician Andre-Marie Ampere, who is considered as the ‘Father of Electrodynamics’.
The largest water reservoir is the ocean, containing 97.3% of all water on Earth.
The SunBelt is a region defined by warm climate of the United States. Is not a political example although this region coincide with a very fast growing economy and population for the last decades.
Corect answer is C - a formal example
You would most likely find a glacier carved lake in Patagonia. Patagonia is known for their glacier lakes and their mountains. People travel from all over the world to see the beautiful area. The correct answer is D.