The correct answer is C. 1984.
Urdu was granted second language status in Bihar in 1984. This was done through the Bihar Official Language Act, 1981. The act made Urdu one of the official languages of the state, along with Hindi and English. This was a significant step for the Urdu-speaking community in Bihar, as it gave them a greater voice in the affairs of the state.
The act was passed after a long struggle by the Urdu-speaking community. They had been demanding official language status for Urdu for many years. The act was finally passed after the intervention of the then Chief Minister of Bihar, Lalu Prasad Yadav.
The act has had a positive impact on the Urdu-speaking community in Bihar. It has helped to improve their access to education and employment. It has also helped to promote Urdu language and culture in the state.
However, the act has also faced some challenges. There have been some instances of discrimination against Urdu-speaking people. There have also been some attempts to undermine the act. However, the act has survived these challenges and continues to be a source of pride for the Urdu-speaking community in Bihar.
The other options are incorrect. Option A is incorrect because Urdu was not granted second language status in Bihar in 1980. Option B is incorrect because Urdu was not granted second language status in Bihar in 1985. Option D is incorrect because Urdu was not granted second language status in Bihar in 1989.