Final answer:
A Class "B" Division 5 hazardous material pertains to flammable substances, and among the options provided, compressed hydrogen fits this category as it is highly flammable and used as a fuel in FCVs.
Step-by-step explanation:
A Class "B" Division 5 hazardous material is one that is flammable. The options provided include various types of fuels and substances, and we must determine which is considered a flammable hazardous material under the specified classification.
Based on the information, substances that are flammable and are classified as hazardous materials include liquids with flash points below 60 °C, certain non-liquids that can cause fires under specific conditions, ignitable compressed gases and oxidizers. Hydrogen is a highly flammable gas and when compressed, it is used in fuel-cell vehicles (FCV) and is considered a hazardous material due to its flammable properties.
Therefore, the correct answer to the question 'A Class "B" Division 5 hazardous material would be' is d) compressed hydrogen.