Answer : 2. "भारत छोड़ो आंदोलन की वेला में गुप्त कांग्रेस रेडियो चलाने के लिए"
Explanation :

Usha Mehta (25 March 1920 – 11 August 2000) was a Gandhian and freedom fighter of India. She is also remembered for organizing the Congress Radio, also called the Secret Congress Radio, an underground radio station, which functioned for few months during the Quit India Movement of 1942.