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The southernmost hill range in India is the Cardamom Hills. The Nilgiri Hills (option 1) are located in the Western Ghats of Tamil Nadu, Kerala, and Karnataka and are known for their tea and coffee plantations. They are not the southernmost hill range in India. The Annamalai Hills (option 2) are also located in the Western Ghats, in Tamil Nadu and Kerala. While they are geographically close to the Cardamom Hills, they are not the southernmost hill range either. The Nallamalai Hills (option 3) are located in the Eastern Ghats of Andhra Pradesh and are known for their dense forests and wildlife. They are located much further north than the Cardamom Hills, so they are not the southernmost hill range in India. Therefore, the correct answer is option 4, the Cardamom Hills. These hills are located in the Western Ghats of Kerala and Tamil Nadu and are known for their spice production, particularly cardamom.