The correct answer is C. Nawada.
According to the 2011 census, the percentage of irrigated land in Bihar is 46.6%. Of the 38 districts in Bihar, Nawada has the lowest percentage of irrigated land, at 38.1%. The other districts with a percentage of irrigated land less than 50% are Gaya (42.4%), Patna (43.5%), and Siwan (44.4%).
The low percentage of irrigated land in Nawada is due to a number of factors, including the lack of access to irrigation water, the poor condition of irrigation infrastructure, and the low adoption of irrigation technologies. The lack of access to irrigation water is due to the fact that Nawada is located in a semi-arid region with low rainfall. The poor condition of irrigation infrastructure is due to the fact that many of the irrigation canals in Nawada are old and in need of repair. The low adoption of irrigation technologies is due to the fact that many farmers in Nawada are poor and cannot afford to invest in irrigation equipment.
The low percentage of irrigated land in Nawada has a number of negative consequences, including low agricultural productivity, low incomes for farmers, and food insecurity. Low agricultural productivity is due to the fact that crops are not able to grow to their full potential without irrigation. Low incomes for farmers are due to the fact that they are not able to produce enough food to meet their own needs and to sell for a profit. Food insecurity is due to the fact that many people in Nawada do not have access to enough food to eat.
There are a number of things that can be done to increase the percentage of irrigated land in Nawada. These include:
- Investing in irrigation infrastructure, such as canals and wells.
- Providing subsidies to farmers to help them purchase irrigation equipment.
- Promoting the adoption of irrigation technologies, such as drip irrigation and sprinkler irrigation.
- Providing training to farmers on how to use irrigation technologies.
- Raising awareness of the importance of irrigation among farmers and policymakers.