The development of what industry was most responsible for advances in mass production? (A) railroads (B) lumber (C) communications (D) hand tools

Progress in production and technology has enabled the development and application of technological systems, such as rail and telegraph networks, gas pipelines, water supply systems, etc. Mass production was necessary to provide large quantities of goods, easy access and transportation of raw materials and products and their delivery. Thus, the expansion of railways has allowed a great increase in supply and distribution.

The answer is: (A)

Your answer is railroads