Final answer:
Cyrus McCormick used a combination of methods, including steam-driven machinery, lease-to-own sales, and a network of sales agents, to profit from his invention of the reaper.
Step-by-step explanation:
Cyrus McCormick's method to profit from his invention of the reaper was multi-faceted and innovative. He used steam-driven machines to make parts for his reaper, which were then assembled by workers on a conveyor belt. This assembly line process allowed for efficient and faster production. Additionally, McCormick offered his reaper on a lease-to-own basis, making it more affordable for farmers. Lastly, he established a network of sales agents spread across the country to effectively market his reaper to farmers in different regions. Therefore, the correct answer is option D: All of the above.