The correct answer is: a) The interior districts.
Drought is a recurring hazard in Tamil Nadu, especially affecting the interior districts. The interior districts are located in the central and northern parts of the state, and are characterized by a semi-arid climate. The region receives less rainfall than the coastal regions, and is also more prone to droughts.
The coastal regions of Tamil Nadu are located in the southern and western parts of the state. The region receives more rainfall than the interior districts, and is also less prone to droughts. The Western Ghats are a mountain range that runs along the western coast of India. The Western Ghats are a major source of rainfall for Tamil Nadu, and the region is less prone to droughts.
Urban areas are located in all parts of Tamil Nadu. Urban areas are more developed than rural areas, and have access to better infrastructure and resources. However, urban areas are also more prone to droughts, as they are more dependent on water from reservoirs and groundwater.
In conclusion, the correct answer is: a) The interior districts.