The practice of intensive agriculture in Bihar can lead to:

Soil depletion
Soil erosion
Soil salinization
All of the above

The correct answer is: All of the above.

Intensive agriculture is a type of agriculture that uses large amounts of inputs, such as fertilizers, pesticides, and water, to produce high yields. This type of agriculture can lead to a number of environmental problems, including soil depletion, soil erosion, and soil salinization.

Soil depletion is the loss of nutrients from the soil. This can happen when crops are harvested without being replaced with nutrients, or when the soil is exposed to erosion or other forms of degradation. Soil depletion can lead to a decline in crop yields and an increase in the need for fertilizers.

Soil erosion is the removal of soil from the land by wind or water. This can happen when the land is not properly protected, such as when it is left bare after harvesting. Soil erosion can lead to a loss of topsoil, which is the most fertile layer of soil. It can also lead to a decline in crop yields and an increase in the need for fertilizers.

Soil salinization is the accumulation of salt in the soil. This can happen when irrigation water contains high levels of salt, or when the soil is not properly drained. Soil salinization can lead to a decline in crop yields and an increase in the need for water.

In addition to these environmental problems, intensive agriculture can also lead to social and economic problems, such as the displacement of rural communities and the loss of traditional livelihoods.

Overall, intensive agriculture is a type of agriculture that can have a number of negative environmental and social impacts. It is important to carefully consider the potential impacts of intensive agriculture before adopting this type of farming practice.