In 2004, the people of Nantong finally realized their railway dream. During New Year's Day, a striking slogan was hung at Nantong Railway Station: "It is prohibited to carry flammable, explosive and

In 2004, the people of Nantong finally realized their railway dream. During New Year's Day, a striking slogan was hung at Nantong Railway Station: "It is prohibited to carry flammable, explosive and corrosive substances."

Flammables, explosives, corrosives and dangerous goods pose a threat to the safety of passengers, so they are strictly prohibited;

A, B, and C are not flammable Explosives and corrosive items can be brought into passenger trains; firecrackers are explosives, so they cannot be brought into passenger trains.

So choose D.