The correct answer is: A. Triveni Canal
The Triveni Canal is the oldest canal project of Bihar. It was constructed in 1789 by the British East India Company. The canal is about 100 kilometers long and irrigates an area of about 200,000 hectares. The canal originates from the Son River and flows through the districts of Patna, Nalanda, and Gaya.
The Triveni Canal is an important source of irrigation for the farmers of Bihar. It also provides drinking water to the people of the region. The canal is a major tourist attraction and is known for its scenic beauty.
The other options are incorrect because they are not the oldest canal projects of Bihar.
- The Son Canal was constructed in 1874.
- The Rajpur Canal was constructed in 1903.
- The Sakri Canal was constructed in 1912.