The correct answer is: a) Interior regions.
Tamil Nadu is a state in southern India. It is bordered by the states of Kerala to the west, Karnataka to the northwest, Andhra Pradesh to the north, and Puducherry to the northeast. The Bay of Bengal lies to the east and the Indian Ocean to the south.
Tamil Nadu is a tropical state with a hot and humid climate. The average temperature ranges from 25°C to 35°C. The state receives an average annual rainfall of 700-800 mm.
Tamil Nadu is prone to droughts. The state has experienced several droughts in recent years, including the 2016 drought, which was the worst in over a century. The drought affected over 60% of the state’s population and caused widespread crop failure.
The interior regions of Tamil Nadu are more prone to droughts than the coastal areas. This is because the interior regions are located in the rain shadow of the Western Ghats. The Western Ghats are a mountain range that runs along the western coast of India. The mountains block the moisture-laden winds from the Arabian Sea, which results in lower rainfall in the interior regions.
The coastal areas of Tamil Nadu receive more rainfall than the interior regions. This is because the coastal areas are located in the path of the northeast monsoon. The northeast monsoon is a seasonal wind that blows from the Bay of Bengal to the Indian Ocean. The monsoon brings heavy rainfall to the coastal areas of Tamil Nadu.
The mountainous areas of Tamil Nadu also receive more rainfall than the interior regions. This is because the mountains are higher than the surrounding areas. The higher altitude results in lower temperatures and higher humidity, which favors the formation of clouds and rain.
The river deltas of Tamil Nadu are not as prone to droughts as the interior regions. This is because the deltas are located in the path of the rivers. The rivers bring water from the interior regions to the deltas. The water from the rivers helps to irrigate the crops in the deltas.