Who among the following was the founder of the 'Self-Respect Movement'?

The Self-Respect Movement (Suya Mariyathai Iyakkam) was founded by E. V. Ramasamy 'Periyar' in 1925 in Tamil Nadu. It was a social movement aimed at achieving a society where backward castes had equal human rights, and encouraging backward castes to have self-respect in the context of a caste-based society that considered them inferior. The movement opposed Brahminical dominance, promoted rationalism, atheism, women's rights, and inter-caste marriages, and laid the foundation for the Dravidian movement in Tamil Nadu.