The correct option is C Abolition of Sati
Raja Ram Mohan Roy was a vehement critic of regressive social practices. He even co-founded an organisation in Calcutta, the Brahmo Samaj, to voice against the atrocities like Sati. Due to the tireless campaigning of the Brahmo Samaj and reformers like Raja Ram Mohan Roy, Sati was banned in 1829.