The correct answer is D. Agro-based industries.
Bihar has a large agricultural sector, which accounts for about 25% of the state’s GDP. The state has a favorable climate for growing a variety of crops, including rice, wheat, maize, pulses, and oilseeds. The state also has a large livestock population, which provides a source of meat, milk, and other products.
Agro-based industries can help to increase the value of agricultural produce, create jobs, and improve rural livelihoods. Some examples of agro-based industries include food processing, dairy processing, poultry farming, and fisheries.
Oil refineries are not a viable option for Bihar, as the state does not have any oil reserves. Forest-based industries are also not a major contributor to the state’s economy. Sand mining is a controversial issue in Bihar, as it has been linked to environmental degradation and land disputes.
Therefore, the most promising option for Bihar is to develop agro-based industries. These industries have the potential to create jobs, improve rural livelihoods, and increase the value of agricultural produce.