A social reformer and founder of the Arya Samaj in Karnataka:

The correct answer is B. Dayananda Saraswati.

Dayananda Saraswati was a Hindu reformer and the founder of the Arya Samaj. He was born in Gujarat, India in 1824. He was a child prodigy and learned Sanskrit, the Vedas, and other Hindu scriptures at a young age. He was also a critic of Hinduism and believed that it had become corrupt. He founded the Arya Samaj in 1875 to reform Hinduism and return it to its original Vedic roots. The Arya Samaj promoted education, widow remarriage, and women’s rights. It also opposed caste discrimination. Dayananda Saraswati died in 1883.

A is incorrect. Swami Vivekananda was a Hindu monk and the chief disciple of Ramakrishna. He was born in Kolkata, India in 1863. He was a charismatic preacher and traveled to the United States and Europe to spread Hinduism. He founded the Ramakrishna Mission in 1897. Swami Vivekananda died in 1902.

C is incorrect.