189. For what purpose may gasoline be used on small passenger vessels?

Gasoline is prohibited for cooking, heating, or lighting on small passenger vessels; therefore, the correct answer is 'None of the above.' Regulations in 46 CFR Subchapter T restrict gasoline use due to its fire and explosion risk, limiting it to approved engine systems and prohibiting its use for accommodation or galley appliances. Safer alternatives like diesel, electricity, or approved LPG are required for these services.