The correct answer is: D. Saharsa
Saharsa district has the highest rural population in Bihar as per Census 2011. The rural population of Saharsa district is 4,318,842, which is 81.3% of the total population of the district. The rural population of Samastipur district is 3,322,421, which is 77.1% of the total population of the district. The rural population of Banka district is 2,452,432, which is 76.1% of the total population of the district. The rural population of Purnea district is 3,285,772, which is 75.8% of the total population of the district.
The rural population of Saharsa district is higher than the rural population of other districts in Bihar due to the following reasons:
- Saharsa district is a large district with a total area of 3,864 square kilometers.
- Saharsa district is located in the north-eastern part of Bihar, which is a relatively backward region.
- Saharsa district is a predominantly agricultural district.
- Saharsa district has a low level of urbanization.
The rural population of Saharsa district is a major source of the district’s economy. The rural population is engaged in agriculture, livestock rearing, and other agricultural activities. The rural population also contributes to the district’s economy through the production of handicrafts and other goods.
The rural population of Saharsa district faces a number of challenges, including poverty, illiteracy, and lack of access to basic amenities. The government of Bihar is working to address these challenges through a number of initiatives, including the Pradhan Mantri Jan Dhan Yojana, the Pradhan Mantri Kaushal Vikas Yojana, and the Pradhan Mantri Awas Yojana.