Correct answer: Bhagat Singh.
Bhagat Singh made the slogan 'Inquilab Zindabad', meaning 'Long live the revolution', famous during India's freedom struggle. He shouted it while throwing a bomb in the Central Legislative Assembly in 1929, and it became one of the most recognised cries of the independence movement. It is worth noting that the phrase was originally coined earlier by the poet and freedom fighter Hasrat Mohani, but it is Bhagat Singh who is most closely associated with popularising it.