The Navadurgas are nine specific forms of Durga: Shailaputri, Brahmacharini, Chandraghanta, Kushmanda, Skandamata, Katyayani, Kalaratri, Mahagauri, and Siddhidatri. While Mahakali is a powerful goddess and form of Durga, she is not traditionally listed as one of the nine Navadurgas. Bhadrakali, Bhairavi, and Bhavani are forms of the goddess but are not the correct answer here.