RG Bhandarkar was a popular leader of which reforming society?

Correct option is A

(a) Prarthana Samaj
RG Bhandarkar was a significant figure in the Prarthana Samaj, a movement that promoted social and religious reform among Hindus and aimed to break the caste system.
Prarthana Samaj was founded in 1867 in Bombay (now Mumbai), India. The organization was established by Dr. Atmaram Pandurang and was later influenced and supported by prominent leaders like Justice Mahadev Govind Ranade. The primary aim was to promote social and religious reform in Maharashtra. Prarthana Samaj emphasized monotheism and was inspired by the teachings of the Brahmo Samaj, founded by Raja Ram Mohan Roy.