The correct answer is C. 30 lac hectare.
The expansion of forest in Bihar is on the area of 30 lac hectare. This is a significant increase from the previous area of 28 lac hectare. The expansion is due to a number of factors, including the government’s efforts to increase forest cover, the planting of trees by individuals and organizations, and the natural regeneration of forests.
The expansion of forest cover is beneficial for a number of reasons. It helps to improve the environment by reducing pollution, providing habitats for wildlife, and regulating the climate. It also helps to improve the economy by providing jobs in the forestry sector and by increasing the value of land.
The expansion of forest cover is a positive development for Bihar. It will help to improve the environment, the economy, and the lives of the people of Bihar.
Option A is incorrect because the expansion of forest in Bihar is on the area of 30 lac hectare, not 28 lac hectare.
Option B is incorrect because the expansion of forest in Bihar is on the area of 30 lac hectare, not 29 lac hectare.
Option D is incorrect because the expansion of forest in Bihar is on the area of 30 lac hectare, not 31 lac hectare.