Concept:The book 'Gulamgiri' was written by the social reformer Jyotirao Phule in 1873.Explanation:Jyotirao Phule, also known as Mahatma Phule, was an Indian social activist and writer.He founded the Satyashodhak Samaj (Truth-Seeker Society) in 1873.In the same year, he wrote 'Gulamgiri', which means slavery.Phule dedicated this book to the Americans who fought to end slavery in the U.S. Civil War.He linked the oppression of African Americans with the condition of lower castes in India.Answer:Option A: Jyotirao Phule