Kerala has potential reserves of:

The correct answer is (a) Gold.

Kerala has potential reserves of gold, which are estimated to be around 200 tonnes. The gold is found in the form of alluvial deposits in the rivers of Kerala. The gold mining industry in Kerala is still in its early stages, but it has the potential to become a major contributor to the state’s economy.

The other options are incorrect because:

• Copper is not found in Kerala.
• Bauxite is found in Kerala, but the reserves are not as large as the gold reserves.
• Lead is found in Kerala, but the reserves are even smaller than the bauxite reserves.

I hope this helps!