Modern irrigation techniques like drip and sprinkler irrigation are promoted to:

The correct answer is: d) All of the above

Modern irrigation techniques like drip and sprinkler irrigation are promoted to improve water-use efficiency, reduce salinization, and grow water-intensive crops.

• Improve water-use efficiency: Modern irrigation techniques can help to improve water-use efficiency by delivering water directly to the roots of plants, where it is most needed. This can help to reduce evaporation and runoff, and can also help to prevent soil erosion.
• Reduce salinization: Salinization is a problem that can occur when irrigation water contains high levels of salt. Over time, this can build up in the soil, making it difficult for plants to grow. Modern irrigation techniques can help to reduce salinization by using less water, and by using methods that help to leach salt out of the soil.
• Grow water-intensive crops: Modern irrigation techniques can also help to grow water-intensive crops in areas where water is scarce. For example, drip irrigation can be used to deliver water directly to the roots of plants, which can help to reduce the amount of water that is lost to evaporation.

In conclusion, modern irrigation techniques like drip and sprinkler irrigation are promoted to improve water-use efficiency, reduce salinization, and grow water-intensive crops.