The correct answer is D. Tukaram.
Tukaram was a Marathi poet-saint who lived in the 17th century. He is considered one of the most important figures in the Bhakti movement, which was a religious movement that emphasized the importance of devotion to God over ritual and social distinctions. Tukaram’s poetry is full of devotion to God and love for all people, regardless of their social status. He is also known for his opposition to caste discrimination and his advocacy for social equality.
Gnanadeva was a 13th-century Bhakti saint who is considered one of the founders of the Varkari sect. He was a disciple of Namdev and is known for his teachings on the importance of devotion to God.
Namdev was a 13th-century Bhakti saint who is considered one of the most important figures in the Varkari sect. He was a disciple of Dnyaneshwar and is known for his devotional songs and poems.
Ekanatha was a 16th-century Bhakti saint who is considered one of the most important figures in the Varkari sect. He was a disciple of Namdev and is known for his devotional songs and poems.
All of these saints were important figures in the Bhakti movement, but Tukaram is the only one who is specifically known for his opposition to all social distinctions.