Who among the following was an advocate of radical humanism?

M. N. Roy (Manabendra Nath Roy) was the founder of the Communist Party of India and later developed the philosophy of 'radical humanism,' which emphasized human freedom, rationalism, and secularism beyond traditional Marxist framework. Annie Besant was a theosophist, Raja Ram Mohan Roy a social reformer, and Savarkar a Hindu nationalist.