Dioxin is a persistent organic pollutant. At present, there are various verification questions on the treatment of dioxin. First, the detection technology of dioxin is very high, the sampling requirements are very strict, and special high sensitivity is required. Detection equipment. Secondly, dioxin compounds are widely distributed and there are many pollution sources. Waste incineration is an important source of dioxin. The United States, Japan, and Germany have more advanced technologies to deal with, such as activated carbon adsorption, catalyst treatment, etc. , but China rarely adopts these methods at present. As a developing country, the technology and cost of pollutant treatment are issues to be considered. According to this passage, what is the correct understanding? ['Technology and cost are the main factors restricting the treatment of dioxin pollution in China.', 'China does not yet have the technical level to detect dioxins from the environment.', 'Increased funding can solve current problems.', 'Because of its widespread distribution, eradication of dioxin pollution is impossible.']