The correct answer is: a) Canals and tubewells.
Canals and tubewells are the primary sources of irrigation in Bihar. Canals are artificial waterways that are used to transport water from a source, such as a river or lake, to a destination, such as a field or farm. Tubewells are vertical wells that are drilled into the ground to extract groundwater.
Canals and tubewells are both important sources of irrigation in Bihar because they provide a reliable source of water for crops. Canals are particularly important in areas where there is a lot of rainfall, as they can help to distribute the water evenly and prevent flooding. Tubewells are important in areas where there is less rainfall, as they can provide a source of water even during dry periods.
In addition to canals and tubewells, other sources of irrigation in Bihar include rivers and lakes, tanks and ponds, and drip irrigation and
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