The correct answer is: Water conservation.
Mera Pani Meri Virasat is a national water conservation campaign launched by the Government of India in 2015. The campaign aims to raise awareness about the importance of water conservation and to promote water-saving practices among the people. The campaign also provides financial assistance to farmers for adopting water-saving technologies.
Crop diversification is the practice of growing a variety of crops in a single field. This helps to reduce the risk of crop failure due to pests, diseases, and drought. Organic farming is a type of agriculture that does not use synthetic pesticides, herbicides, or fertilizers. Organic farming is beneficial for the environment and for human health. Solar irrigation is a type of irrigation that uses solar energy to power pumps that draw water from wells or other sources. Solar irrigation is a sustainable and efficient way to irrigate crops.
In conclusion, the correct answer is: Water conservation. The other options are also important, but they are not the focus of the Mera Pani Meri Virasat campaign.