Answer : 3. "Kolkata"
Explanation :

The Union Minister of Coal and Mines inaugurated the National Landslide Forecasting Centre at the Geological Survey of India (GSI) in Kolkata. The Bhusanket Web Portal and Bhooskhalan Mobile App were launched to facilitate landslide hazard data dissemination and forecasting. The GSI, established in 1851, focuses on geoscientific information and mineral resource assessment through surveys and research. The GSI headquarters is in Kolkata, with six regional offices across India.