Option 1 -> Chhau is a traditional tribal martial dance form from eastern India, but not classified as classical.
Option 2 -> Sattriya is a dance form from Assam originating in Vaishnavite monasteries, recognized as the eighth classical dance form of India.
Option 3 -> Garba is a popular folk dance from Gujarat performed during Navratri, not a classical form.
Option 4 -> Bhangra is a vibrant folk dance from Punjab, not a classical form.
Hence, Option 2: Sattriya -> On 15 November 2000, the Sangeet Natak Akademi officially recognized Sattriya as the eighth classical dance form of India. This dance form has its roots in the 15th-century Vaishnavite monasteries (Sattras) of Assam and was initiated by the great saint Srimanta Sankardev -> correct