Which of these technologies was able to spread because of the growth of american railroad networks ?
a. the electric light bulb
b. the telegraph
c. the mechanical harvester
d. the internal combustion engine

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.

(b) britain had a much larger navy than the u.s.

(d) the u.s. had a small army compared to britain.