The correct answer is C. 200 cm.
Eastern Bihar receives an average annual rainfall of 200 cm. This is due to the fact that the region is located in the monsoon belt. The monsoon is a seasonal wind that blows from the southwest to the northeast during the summer months. This wind brings with it a lot of moisture, which results in heavy rainfall.
The rainfall in Eastern Bihar is essential for the region’s agriculture. The crops that are grown in the region, such as rice, sugarcane, and jute, require a lot of water. The rainfall also helps to replenish the groundwater aquifers, which are used for drinking water and irrigation.
The rainfall in Eastern Bihar can also be a cause of flooding. The region is located in a low-lying area, and the heavy rains can cause the rivers to overflow their banks. This can lead to widespread damage to property and crops.
Despite the risks, the rainfall in Eastern Bihar is essential for the region’s economy and environment. The government has taken steps to mitigate the risks of flooding, such as building embankments and drainage systems. The government is also working to improve the irrigation system in the region, so that the farmers can make the most of the available water.