Which of the Following Is Correct with Respect to the Production

Which of the following is correct with respect to the production era?

A) It began with the invention of the steam engine.
B) The scientific management movement emphasized the management of people through an understanding of the needs they brought to the workplace.
C) Mass production increased the available labour pool because many people could be trained to carry out assembly line tasks.
D) Workers gained more freedom during the production era.
E) None of these statements are accurate.