Generally speaking, oil quality standards are formulated by the petrochemical industry, and environmental protection departments do not have the relevant oil quality supervision authority. Therefore, it is difficult for environmental protection departments to face the problems of large amounts of pollutant emissions and air pollution caused by urban traffic flow. Really take effective measures. To reach the above conclusion, which of the following needs to be added as a premise? ['Improved quality of A oil can effectively reduce vehicle pollutant emissions.', 'oil quality improvement requires the petrochemical industry to improve the corresponding standards.', 'The environmental protection department has the right to decide on the formulation of oil quality standards.', 'The current environmental protection department has weak supervision over the petrochemical industry.']