Concept:Usha Mehta is best known for her secret radio broadcasts during the Quit India Movement, which helped spread nationalist messages when mainstream leaders were jailed.
Explanation:During the 1942 Quit India Movement, the British arrested top Congress leaders under Operation Zero Hour.
To counter this censorship, Usha Mehta, along with a small team, set up the Secret Congress Radio (also called Azad Hindi Radio).
Its first broadcast aired on August 14, 1942, using a frequency of 42.34 meters.
The transmitter was frequently moved to hidden locations in Bombay to avoid detection by British authorities.
For nearly three months, the radio delivered uncensored news and messages from Mahatma Gandhi and other leaders.
The team was betrayed and arrested on November 12, 1942, and Usha Mehta served a rigorous imprisonment in Yerawada Jail.
After independence, she became a respected academic and received the Padma Vibhushan in 1998.
Other options—armed struggle, execution, or mass protests—are linked to different figures like the INA, Matangini Hazra, or Aruna Asaf Ali, not Usha Mehta.
Answer:B. Organizing the underground radio to broadcast nationalist messages