The correct answer is option 1, Bombay. Swami Dayanand Saraswati, a prominent Indian philosopher and social reformer, founded the first Arya Samaj in Bombay in 1875. The Arya Samaj is a Hindu reform movement that seeks to promote social and spiritual upliftment through the revival of Vedic teachings. It aims to eradicate social evils such as caste discrimination, child marriage, and female infanticide. The establishment of the Arya Samaj in Bombay was a significant milestone in the history of the movement, as it provided a platform for the propagation of its principles and the spread of its reformist ideas. This marked the beginning of a new era in the Hindu society, emphasizing a return to the true teachings of the Vedas.