Final answer:
Carnegie, Vanderbilt, and McCormick are correctly identified as industrial entrepreneurs who significantly contributed to America's industrial growth in the late nineteenth century. Their business strategies and innovations transformed major industries, helping to shape the modern United States. Hence, the given statement is "true", option a is correct.
Step-by-step explanation:
Andrew Carnegie, Cornelius Vanderbilt, and Cyrus McCormick are indeed examples of industrial entrepreneurs. These individuals played pivotal roles in transforming America's economic landscape during the late nineteenth century through their innovative business practices and the expansion of various industries. Carnegie, a steel magnate, utilized the Bessemer process to revolutionize the steel industry, enabling him to dominate the U.S. market by employing strategies like vertical integration. Vanderbilt, known as the Commodore, was instrumental in consolidating railroad companies and creating efficient transportation networks, which greatly influenced the success of the American economy. Meanwhile, McCormick advanced agricultural efficiency with his development of the mechanical reaper, contributing to the growth of the farming industry.
Their entrepreneurial acumen not only led to the creation of vast personal wealth but also fueled industrial growth, transforming the United States from a largely rural society to a more urbanized one. The question posed, whether Carnegie, Vanderbilt, and McCormick are examples of industrial entrepreneurs, can be confidently answered as true.