After the completion of the railroad, a major industry in the West was ranching. Thus the correct answer is A.
What is Industry?
The industry refers to an area where the activity of manufacturing or production of goods and their assembly will be done in order to distribute to intermediaries to serve the customers.
Railroad helps to travel from one location to another in a quick manner and helps in exporting raw materials as well as goods. It is the cheapest and safest way to move in ancient times.
Maintaining grazing of animals on big land areas is known as ranching. Grassland animals like sheep and cattle are frequently raised by ranchers. Railroads assist in transporting cattle from one point to another.
Due to its geography, the whole of the West became a grazing zone. People were able to start farms because of the Great Plains.
Therefore, option A ranching is appropriate.
Learn more about Industry, here:
https://brainly.com/question/18310687
#SPJ6
