With reference to Indian freedom struggle, Usha Mehta is well-known for

1. Usha Mehta was a prominent Gandhian and freedom fighter during the Indian freedom struggle. 2. She is particularly well-known for her role during the Quit India Movement of 1942. 3. Following the arrest of major leaders, Usha Mehta, along with others, played a crucial role in establishing and running an underground radio station, known as the secret Congress Radio. 4. This radio broadcasted uncensored news, messages from leaders, and information about the progress of the movement, helping to sustain morale and coordinate activities for several months before being shut down by the authorities. 5. Option (B) is incorrect; prominent women delegates like Sarojini Naidu attended the Second Round Table Conference, but not Usha Mehta in this capacity. 6. Option (C) is incorrect; Lakshmi Sahgal was famous for leading the women's regiment (Rani of Jhansi Regiment) of the Indian National Army (INA). 7. Option (D) is incorrect; assisting in the formation of the Interim Government involved key political figures of the time.