Which of the following reforming societies believed Vedas to be the fountain of all the knowledge?

Correct option is C

The correct answer is (c) Arya Samaj.
• The Arya Samaj, founded by Swami Dayanand Saraswati in 1875, strongly believed in the Vedas as the infallible source of all knowledge.
• They advocated for "Go Back to the Vedas" and emphasized Vedic rituals and practices.
• Prarthana Samaj: Founded by Atmaram Pandurang in 1867, the Prarthana Samaj focused on social reform and emphasized monotheism and rationalism.
• Brahmo Samaj: Founded by Raja Ram Mohan Roy in 1828, the Brahmo Samaj rejected idolatry and emphasized monotheism and ethical principles.