Prior to the London Olympics, in order to effectively improve air quality in London, the mayor and member of the Olympic Committee, Boris Johnson, announced that large trucks and light buses must meet low-emission zone standards by January 2012. It has been included in low-emission zones since October 2010. If you do not meet the emission standards, you must pay a fine. This shows that the biggest cause of pollution in London is the amount of pollution emitted by traffic. Which of the following, if true, best supports the above judgment? ['The biggest pollution problem in London is air pollution, and the pollutants in the air mainly come from the emissions of traffic flow.', 'Since the turn of the 2000s, London has not seen any innovation or progress in limiting vehicle emissions, and urban air quality has also been poor.', 'The generation of pollutants comes from the direct discharge of pollution on the one hand, and from the weather on the other, because we cannot control the weather, we can only control the amount of pollution emitted.', "Huge traffic is the main cause of the city's two major pollution sources (particulate matter and nitrogen dioxide). A diesel car produces much more pollution than a gasoline car, and many vehicles in London are powered by diesel."]