Q. Who among the following founded the “Prarthana Samaj”?
Explanation: In 1867, Keshab Chandra Sen helped Atmaram Pandurang found the Prarthana Samaj in Bombay. Earlier, the Brahmo ideas spread in Maharashtra.
A precursor of the Prarthana Samaj was the Paramahansa Sabha, something like a secret society to spread liberal ideas and encourage the breakdown of caste and communal barriers.
Source: Spectrum Modern India