Final answer:
Liquefied acetylene is an example of a flammable liquid.
Step-by-step explanation:
An example of a flammable liquid is liquefied acetylene (Answer B).
Acetylene gas, C₂H₂, is a highly flammable substance that is commonly used in welding torches due to its high heat of combustion. It burns at an extremely high temperature of 3300°C. When acetylene gas is liquified, it becomes more stable and can be safely stored and transported.