The correct option is C The harsh response of British and the arrests of the leaders in the early days of the movement.
As soon as the Quit India Movement was launched, most of the leaders were arrested by the British. But many of them like Jayaprakash Narayan and Ramanand Misra kept the movement rolling. Many people continued working underground to escape from the British arrest or repression. One such leader, Usha Mehta, launched an underground radio to spread Gandhi's word of "Quit India".