The correct answer is option 1, Tamil Nadu. The Todas are an indigenous tribal group mainly found in the Nilgiri Hills of Tamil Nadu, a state in southern India. The Nilgiri Hills are part of the Western Ghats mountain range. The Todas have a distinct culture and are known for their unique language and traditional pastoral way of life. They live in small settlements called "munds" and practice agriculture and dairy farming. The Todas are also known for their unique style of dwelling, known as "todas huts," which are barrel-shaped structures made of bamboo and thatch. It is important to note that while some indigenous tribal groups may have similar names across different regions of India, the specific location mentioned in this question refers to the Todas in Tamil Nadu.