The correct answer is (a) Andhra Pradesh.
Andhra Pradesh is the main gold producing state of India. It accounts for about 50% of the country’s gold production. The state has several gold mines, including the Ramagiri mine, the Donimalai mine, and the Atmakur mine.
Karnataka is the second largest gold producing state in India. It accounts for about 25% of the country’s gold production. The state has several gold mines, including the Hutti mine, the Bellary mine, and the Kolar mine.
Bihar is the third largest gold producing state in India. It accounts for about 10% of the country’s gold production. The state has several gold mines, including the Sonbhadra mine, the Gaya mine, and the Nawada mine.
Uttar Pradesh is the fourth largest gold producing state in India. It accounts for about 5% of the country’s gold production. The state has several gold mines, including the Sonbhadra mine, the Mirzapur mine, and the Allahabad mine.
The other options are incorrect because they do not account for a significant share of India’s gold production.