The correct answer is option 3 - Swami Dayanand Saraswati. Arya Samaj was founded by Swami Dayanand Saraswati in 1875. Swami Dayanand Saraswati was a prominent Hindu reformer and philosopher. He believed in the ancient Vedic teachings and sought to promote Vedic principles and ideals as a way to reform and revive Hinduism. The Arya Samaj was established with the aim of promoting social and religious reforms, such as the abolition of caste system, equal rights for women, and the promotion of education. Swami Dayanand Saraswati emphasized on the principles of truthfulness, righteousness, and the worship of one true God. He advocated for the use of Vedic scriptures as the sole authority for religious and moral knowledge. The Arya Samaj played a significant role in the Indian independence movement and continues to be active in promoting social and educational initiatives.