Which of the following is mica producing area in India? I. Patna II.…

India's mica reserves are concentrated in a narrow belt along the northern fringe of the Chota Nagpur plateau — running through Koderma, Giridih, and Hazaribagh in Jharkhand and extending into Gaya district of Bihar. This Koderma-Gaya-Hazaribagh belt supplies the bulk of India's high-quality sheet mica, and Jharkhand alone contributes the largest share of the country's mica output.

Checking each location against this mica belt: Hazaribagh (statement II) lies directly within the Koderma-Gaya-Hazaribagh mica tract and has long been mined for mica. Statements I and III place mica production in Patna and Gandhi Nagar — neither falls inside the mica belt, so they must be excluded.

• Patna: capital of Bihar, situated in the Gangetic alluvial plain; known for administrative and trade activity, not mica mining.

• Gandhi Nagar: capital of Gujarat, a planned administrative city; no mica deposits are associated with the region.

Since only Hazaribagh (II) lies in the mica-producing belt, only statement II is correct.