"Satyartha Prakash" was written by which of the following?

Swami Dayanand Saraswati

The correct answer is Option 2- Swami Dayanand Saraswati

 Swami Dayanand Saraswati wrote "Satyartha Prakash".

"Satyarth Prakash" (meaning "The Light of Truth") was written by Swami Dayananda Saraswati, the founder of the Arya Samaj.

"Satyartha Prakash" was a very influential book, and it helped to inspire the Arya Samaj, a Hindu reform movement that was founded by Swami Dayanand Saraswati in 1875. The Arya Samaj is still active today, and it has played an important role in the revival of Hinduism in India.