The correct answer is option 4: All of the above. Let`s analyze each option to understand why it helps in controlling environmental pollution.

Option 1: Checking atomic blasts. Atomic blasts release huge amounts of harmful radiation, which can cause severe environmental pollution. By controlling and minimizing atomic blasts, we can reduce this pollution.

Option 2: Manufacturing electric vehicles. Electric vehicles are powered by electricity instead of fossil fuels. Since fossil fuels contribute to air pollution, replacing traditional vehicles with electric ones helps reduce pollution and improve air quality.

Option 3: Sewage treatment. Improper sewage disposal can result in water pollution, endangering marine life and causing health hazards. By treating sewage before releasing it into water bodies, we can eliminate harmful contaminants and minimize pollution.

Thus, the combination of these three actions - checking atomic blasts, manufacturing electric vehicles, and sewage treatment - will contribute to controlling environmental pollution.