Which of the following is not classified as a flammable liquid or gas that is prohibited on the bus?

Ordinary beverages are classified differently than flammable liquids or gases. They typically include non-alcoholic drinks like water, soda, and juice, which do not possess the volatile characteristics that would make them flammable. Consequently, these substances do not pose the same risks as solvents, aerosol sprays, or powders in spray bottles, which can be hazardous due to their potential to ignite and cause fires. It is essential to ensure passenger safety by prohibiting dangerous materials while allowing benign options like ordinary beverages on the bus.