The correct answer is C. Both (A) and (B).
Construction of dams can lead to a decrease in soil fertility by reducing the amount of water that is available for irrigation. This can cause crops to become waterlogged, which can lead to the loss of nutrients and the death of plants. Additionally, dams can also lead to the erosion of soil, which can further reduce the amount of land that is available for agriculture.
Adoption of faulty methods of agriculture can also lead to a decrease in soil fertility. For example, the use of chemical fertilizers can pollute the soil and make it less productive. Additionally, the use of heavy machinery can compact the soil, which can make it difficult for plants to grow.
Both of these factors can contribute to a decrease in soil fertility, which can have a negative impact on the agricultural sector and the environment.
Here are some additional details about each option:
- Option A: Construction of dams can lead to a decrease in soil fertility by reducing the amount of water that is available for irrigation. This can cause crops to become waterlogged, which can lead to the loss of nutrients and the death of plants. Additionally, dams can also lead to the erosion of soil, which can further reduce the amount of land that is available for agriculture.
- Option B: Adoption of faulty methods of agriculture can also lead to a decrease in soil fertility. For example, the use of chemical fertilizers can pollute the soil and make it less productive. Additionally, the use of heavy machinery can compact the soil, which can make it difficult for plants to grow.
- Option C: Both (A) and (B) can lead to a decrease in soil fertility.
- Option D: None of the above is not the correct answer.