Correct answer: C. Spreading messages amid colonial censorship
Explanation: The direct answer is option C: underground radio spread messages amid colonial censorship. In 1942, the Quit India Movement challenged British rule. The British arrested many national leaders and controlled newspapers, so ordinary public communication became difficult. Usha Mehta and her associates operated a secret radio service, commonly known as the Congress Radio. It broadcast news, patriotic messages and information about the movement, helping people remain connected and encouraging resistance. Option A, securing temple entry, refers to struggles against social and religious exclusion, not the main purpose of this radio. Option B, enforcing indigo cultivation, concerns colonial agricultural exploitation and earlier peasant resistance. Option D, recruiting sailors, is unrelated to the communication role of the radio. Therefore C is correct because the radio defeated censorship and carried the movement’s message. Memory cue: underground radio means secret communication during the 1942 movement.