Option C: (A) is true, but (R) is false.
Assertion is correct — India is a tropical country with enormous solar energy potential. But the Reason is false — most of India falls under the tropical zone, not the cold zone.
The textbook states: "India is a tropical country. It has enormous possibilities of tapping solar energy." So (A) is correctly stated. However, (R) says India falls under the "cold zone," which directly contradicts the fact that India is a tropical country receiving abundant sunlight. Since (R) is factually wrong, option C is correct. In Assertion-Reason questions, always check the factual accuracy of both statements separately before checking if R explains A.