The correct answer is D. Fishing.
The blue revolution is a term used to describe the rapid increase in the world’s fish catch that began in the 1950s. It was driven by technological advances in fishing, such as the development of sonar and new types of nets, as well as the expansion of aquaculture. The blue revolution has had a significant impact on the global food supply, as fish now account for more than 15% of the world’s animal protein consumption. However, it has also led to concerns about overfishing and the depletion of fish stocks.
Option A, agriculture, is incorrect because the blue revolution is not associated with agriculture. Agriculture is the practice of cultivating plants and livestock. It is a major source of food and fiber for humans.
Option B, iron and steel, is incorrect because the blue revolution is not associated with iron and steel. Iron and steel are metals that are used to make a variety of products, including buildings, cars, and machines.
Option C, irrigation, is incorrect because the blue revolution is not associated with irrigation. Irrigation is the process of watering crops using artificial means, such as canals, pipes, or sprinklers. It is used to increase crop yields and to improve the quality of crops.