Who formed the Brahmo Samaj of India in 1866?

1. Debendranath Tagore
2. Keshab Chandra Sen
3. Raja Rammohan Roy
4. None of the above

Answer: Keshab Chandra Sen

Explanation: In 1866, Keshab Chandra Sen and his adherents established the Brahmo Samaj of India, which marked a significant development in the Brahmo movement. Consequently, Debendranath’s Samaj of Bengal came to be recognized as the Adi Brahmo Samaj, distinguishing it from the newly formed Brahmo Samaj of India.