Kamaladevi Chattopadhyay, a prominent Indian social reformer and freedom fighter, played a key role in advocating for women's participation in the Salt March during the Indian independence movement. She believed in the empowerment of women and recognized the symbolic significance of their involvement in such movements. Kamaladevi Chattopadhyay urged Mahatma Gandhi to allow women to participate actively in the Salt March, highlighting the importance of their contribution to the cause of Indian independence. As a result, Mahatma Gandhi agreed, and women became actively involved in the historic Salt March, contributing to the broader struggle for India's freedom.

So, the correct option is [2].