Detailed Solution:
The correct answer is “Both (A) and (R) are true and (R) is the correct explanation of (A)”.
Chile is the leading producer of copper in the world. As of recent data, Chile consistently ranks at the top in copper production, contributing a significant percentage of the global copper supply.
The Andes region of northern Chile is known to be enriched with some of the largest deposits of porphyry copper. Porphyry copper deposits are a major source of copper, and the geological formations in this region are conducive to such deposits, which is why Chile's production levels are so high.
The relationship between the assertion and the reason indicates that the geological advantage of the Andes in Chile directly contributes to its status as the top copper producer.