Carbon nanotube materials have the advantages of lightweight and high strength, and are widely used in the production of bicycles and rackets. However, recent research has found that workers who have been engaged in the production of carbon nanotubes for a long time or use the material to make other products may have inhaled Carbon nanotubes are carcinogenic. Which of the following, if true, would best support the above findings? ['Studies have shown that some of the longer carbon nanotubes are likely to cause cancer, which may be because they are more likely to get stuck in the cavity between the cells in the lungs or in the abdomen.', "Experiments using human skin cells cultured in vitro show that carbon nanotubes can enter the inside of the cell, reducing the cell's own immune capacity.", 'Animal experiments show that if carbon nanotubes enter the abdomen of rats in large quantities, about 10% of the rats will have abdominal inflammation within one year.', 'Asbestos is a carcinogen recognized by the International Cancer Organization, and carbon nanotubes have some similarities in chemical molecular structure with asbestos.']