Which of the following state of India was the first state to adopt Hindi as the official language?

Bihar

The correct answer is Option (1) - Bihar

Bihar replaced Urdu with Hindi as its sole official language in 1881, becoming the first state in India to adopt the language. Following this, Hindi also became the official language of other states, including Uttar Pradesh, Haryana, and Rajasthan. Hindi was adopted as the official language of India on September 14, 1949, and the day is celebrated as Hindi Divas.