Which of the following is not a power source fuel for the stacker?

The option identifying kerosene as not being a power source fuel for stackers is correct because stackers commonly operate on fuels such as diesel, gasoline, and propane, which are suitable for internal combustion engines used in material handling equipment.

Kerosene, while a hydrocarbon fuel, is not typically utilized in stackers. It is generally used for heating or jet fuel applications rather than providing power for heavy equipment. Diesel and gasoline are more prevalent in forklift designs due to their efficiency and capability to power larger engines. Propane is also a common choice for forklifts because it burns cleaner than gasoline and diesel and is effective in indoor environments. Consequently, kerosene does not align with the standard fuel options for stacker operation.