Answer : 3. "पंडित हरदयाल"
Explanation :

Arya Samaj was founded in 1875 by Swami Dayanand Saraswati in Bombay. Its headquarter was later shifted to Lahore. Arya Samaj focussed on the equality of sexes, love and charity towards all. The Samaj emphasised the Fatherhood of God and the brotherhood of Man. The Samaj started the Shuddhi movement to convert non-Hindus to Hinduism. This became a contributory factor in the spread of Communalism in India in the 20th century. Arya Samaj accepted the authority of Vedas but didn't believe in the authority of the Shastri class.