Explanation:

In 1881, Keshab Chandra Sen established Naba Bidhan ( New Dispensation) meaning new universalist religion after having differences within Brahmo Samaj. He was also part of Indian reform association to legalize Brahmo marriage and to fix minimum age of marriage.
•    Calcutta Unitarian Committee was formed by Raja Rammohan Roy, Dwarkanath Tagore and William Adam, hence irrelevant to the question. Hence Option A and D are eliminated.
•    1881, Keshab Chandra Sen established Naba Bidhan ( New Dispensation) meaning new universalist religion after having differences within Brahmo Samaj. Hence 2nd statement is right. Hence we’re left with Answer B) only 2 and 3.
•   Third statement is right. Sen formed Indian Reform Association (1870) to persuaded the British government to enact the Native Marriage Act of 1872( Civil marriage act) legalizing Brahmo marriages and fixing minimum marriageable act for boys and girls.