Acid rain usually refers to acidic precipitation with a pH value of less than 5.6. It has great harm to human health, ecological environment, and building facilities, and the direct economic losses caused by it each year are tens of billions of dollars. It can be confirmed that Sulfur dioxide and nitrogen dioxide are the main substances that form acid rain, and they form water-soluble species of acids under the action of oxidants in the air. Researchers have pointed out that reducing the use of coal and petroleum is the cure for acid rain. Which of the following prerequisites should the judges of the above researchers take? ['Combustion of coal and petroleum emits large amounts of sulfur dioxide and nitrogen dioxide into the air.', 'Gases emitted after the combustion of coal and petroleum combine with sulfur dioxide, and nitrogen dioxide will form seed acids.', 'The expansion of acid rain area will consume a lot of coal and oil resources, leading to the occurrence of an energy crisis.', 'The oxidant released by the combustion of coal and petroleum causes the combination of sulfur dioxide and nitrogen dioxide to form seed acids.']