During the 30 Years Following the Civil War, the United

During the 30 years following the Civil War, the United States emerged as a leading industrial nation. Which of the following was not cited in the text as an important turning point in business and management history during that time?

A) the presentation by Henry Towne of a paper titled "The Engineer as an Economist" to the American Society of Mechanical Engineers
B) the founding of the American Federation of Labor (AFL)
C) the Haymarket Affair
D) All of the above were cited as important turning points.