Answer:
d. the internal combustion engine
Explanation:
There's a type of railway locomotive in which diesel is the prime mover. This type of railway locomotive is called "A diesel locomotive."
Many different types of these were made, but the main different is usually on how the mechanical power is conveyed to the driving wheels.
Early Internal Combustion locomotives at first used kerosene and gasoline as fuel, but eventually, they were improved. In 1898, steel engines reduced sized and improved power of the locomotives.
