Who among the following wrote Gulamgiri?

The correct answer is Jyotiba Phule.

Explanation:
1. Gulamgiri (which translates to 'Slavery') is one of the most prominent books written by the social reformer Mahatma Jyotirao Govindrao Phule in 1873.
2. The book presents a strong critique of the caste system, social hierarchy, and the exploitation of marginalized sections in Indian society.
3. Phule dedicated Gulamgiri to the American abolitionist movement that worked to end slavery, connecting the struggle of the oppressed lower castes in India with the African American struggle for freedom in the United States.
4. In the same year (1873), Jyotiba Phule also established the Satyashodhak Samaj (Truth-seekers' Society) to campaign for equal rights, women's education, and the upliftment of lower castes.