Which of the Following Was Not One of the Features

Which of the following was not one of the features that dominated the world of large-scale manufacturing after the Civil War?

A) a new focus on energy conservation and finding alternatives to traditional fossil fuels.
B) the rapid spread of technological innovation.
C) a demand for workers who could be carefully controlled.
D) the constant pressure on firms to compete tooth-and-nail by cutting costs and prices, eliminating rivals, and creating monopolies.
E) a relentless drop in prices.