The correct answer is A) improvements in transportation.
The change that led to a transition from the First to the Second Industrial Revolution in the United States was improvements in transportation.
During the first Industrial Revolution in the United States, factories had new machines that allow for Mass Production of goods. This meant more goods produced in less time, and at fewer costs. Companies produced basically natural resources such as cotton, timber, coal, silver, iron, copper, and gold.
During the second Industrial Revolution, technology changed mass production in America. Interchangeable parts in modern machines enhanced production methods and mass production benefited. Also, improvements in transportation allowed better trade. This period started in 1890 and ended at the beginning of World War 1. Goods produced in this period were steel, oil, and rubber.
