Who among the following founded the ‘Arya Samaj’ ?

Correct option is D

The correct answer is (d) Swami Dayanand Saraswati.
Arya Samaj was founded in 1875 in Bombay by Swami Dayanand Saraswati. It is a monotheistic Indian Hindu reform movement that promotes values and practices based on the belief in the infallible authority of the Vedas.
Raja Ram Mohan Roy founded the Brahmo Samaj in 1828. Ishwarchand Vidyasagar was a Bengali social reformer and educator. Swami Vivekananda was a Hindu monk and philosopher who founded the Ramakrishna Mission in 1897.