Concept:The Tattvabodhini Sabha was a progressive society founded by Debendranath Tagore in 1839.
Explanation:Debendranath Tagore established the Tattvaranjini Sabha on 6 October 1839.
It was later renamed the Tattvabodhini Sabha.
The society aimed to promote a rational and humanist form of Hinduism based on the Vedanta and Upanishads.
It was a faction within the Brahmo Samaj, which had been founded earlier by Raja Ram Mohan Roy in 1828.
The Tattvabodhini Sabha worked as a reformist group in Calcutta.
Debendranath also compiled the text "Brahmo Dharma" as a guide for this movement.
Thus, the correct founder and year are Debendranath Tagore and 1839.
Answer:Option A: Debendranath Tagore in 1839