Final answer:
The mechanical reaper inadvertently increased crop production, caused unemployment among farm workers, and led to urbanization. Therefore, the answer is (D) All of the above.
Step-by-step explanation:
The mechanical reaper, invented by Cyrus McCormick, had several inadvertent effects on society and the economy. The reaper increased the production of crops by allowing farmers to harvest grain more efficiently than before. As a result of such technological advancements, there was less need for farm labor, which contributed to unemployment among farm workers. Simultaneously, the increased efficiency in agriculture supported urbanization by driving rural populations to seek industrial jobs in cities. Thus, the mechanical reaper had a notable impact by accelerating agricultural productivity, influencing population migration towards urban centers, and affecting rural labor force dynamics.
Overall, the mechanical reaper inadvertently (A) Increased the production of crops, (B) Led to urbanization, and (C) Caused unemployment among farm workers, making the correct answer (D) All of the above.