Who founded Arya Samaj?

Swami Dayanand Saraswati

The correct answer is Option 4- Swami Dayanand Saraswati.

Ishwar Chand Vidyasagar was a Bengali social reformer who is best known for his work to improve the condition of women in India. He was not the founder of the Arya Samaj.

Shiv Dayal Sahib was a Hindu reformer who was a contemporary of Swami Dayanand Saraswati. He was not the founder of the Arya Samaj.

Raja Ram Mohan Roy was a Bengali social reformer who is considered to be the father of modern India. He was a founder of the Brahmo Samaj, a Hindu reform movement that was founded in 1828.

Swami Dayanand Saraswati was a Hindu monk and philosopher who founded the Arya Samaj in 1875. He was a strong advocate for a return to the Vedas, the oldest Hindu scriptures, and he rejected many of the later Hindu traditions and practices that he saw as being corrupt and degenerate.