Correct answer: Bhagat Singh (option C).The slogan 'Inqlab Zindabad' means 'Long live the revolution'.It was coined by Maulana Hasrat Mohani in 1921.However, it was Bhagat Singh who gave it widespread popularity, raising it in his speeches and writings in the late 1920s during the Indian freedom struggle.Hence, among the given options, Bhagat Singh is the freedom fighter credited with giving this slogan.Iqbal, M.K. Gandhi and S.C. Bose are not associated with this slogan.