Answer:
Step-by-step explanation:
In the early 1900s, the greatest increase in factory output in the United States was probably due to the widespread adoption of mass production techniques. Mass production is a method of manufacturing in which a product is produced in large quantities using specialized machinery and assembly line techniques.
The use of mass production techniques was made possible by the development of new technologies such as the electric motor, which allowed for the creation of specialized machinery and conveyor belts to move the product along the assembly line. The widespread adoption of mass production in the early 1900s was a key factor in the rapid increase in factory output in the United States.
While the other options listed (wireless radio, air transportation, and word-processing equipment) may have had some impact on factory output, they were not as significant as the adoption of mass production techniques.
Answers: B) mass production