Recently, there was a severe haze in some places, and some parents were worried about their children's health. They proposed to install air purifiers in schools, but some experts believe that schools may not be suitable for installing air purifiers. Which of the following, if true, would best strengthen the views of the aforementioned experts:. ["Noise from air purifiers can affect children's learning.", 'The installation of air purifiers cannot completely replace indoor ventilation.', 'The power of suitable air purifiers will overload the power grid.', 'The air purifiers on the market are mixed and the quality is uneven.']