1. The question asks for the correct north-to-south sequence of the given hills in Peninsular India.
2. Nallamalai Hills are located in Andhra Pradesh/Telangana, primarily north of the Penner River.
3. Javadi Hills are located in Tamil Nadu, south of the Nallamalai Hills and north of the Nilgiri Hills.
4. Nilgiri Hills are located at the tri-junction of Tamil Nadu, Kerala, and Karnataka, south of the Javadi Hills.
5. Anaimalai Hills are located south of the Nilgiri Hills, across the Palghat Gap, in Tamil Nadu and Kerala.
6. Therefore, the correct north to south sequence is: Nallamalai Hills - Javadi Hills - Nilgiri Hills - Anaimalai Hills.