Explanation:

- Option 1: 1875

- This is the correct year. Swami Dayanand Saraswati founded the Arya Samaj in 1875.

- Arya Samaj focused on reforming Hindu society by emphasizing the Vedas and monotheism.

- It aimed to promote values of honesty, justice, and education.

- Option 2: 1873

- No major event related to Arya Samaj occurred in 1873.

- This year is not associated with its founding.

- Option 3: 1885

- This was the year the Indian National Congress was established, not related to Arya Samaj.

- Option 4: 1863

- This year is not linked to the founding of Arya Samaj.

- It pre-dates the actual establishment of the organization.

Option 1: 1875