Over a period of time, domestic mobile phones have gradually reduced their share of the domestic market. Studies have found that mobile phone ads from foreign mobile phone companies are more attractive than domestic ads. Therefore, domestic mobile phone manufacturers need to increase advertising investment to increase market share. Which of the following, if true, would seriously weaken the above argument? ? ['Some foreign mobile phone products are produced by domestic advertising companies and distributed by domestic media.', "Advertising can only attract people's attention to a certain product, and quality can make people like products.", 'Advertising costs of domestic mobile phone manufacturers are now only half of those of foreign manufacturers.', 'Despite the increase in sales of foreign mobile phone products, sales of domestic mobile phones are also increasing.']