Option d is the correct answer. Gopal Hari Deshmukh, also known as Lokhitawadi, was a Marathi social reformer, writer, and journalist. He wrote a series of articles under the pen name Lokhitawadi, which were published in the weekly Prabhakar. These articles were later compiled into a book called Satapatra Series. Important Tips Satapatra Series: The Satapatra Series was a collection of essays on social reform, education, and economic development. Deshmukh argued that India needed to undergo a period of social reform in order to achieve progress. He advocated for the abolition of child marriage, the promotion of widow remarriage, and the education of women. He also argued that India needed to develop its own industries in order to become self-sufficient. The Satapatra Series was a significant contribution to the social reform movement in India. It helped to raise awareness of the need for social reform and it inspired others to work for change.