<span>The economy of these early civilizations was based on agriculture. The correct answer is B. Industry and production are incorrect answers because at the time, no technology existed so these options were impossible to live on. While warfare is a plausible option, agriculture is better because it provided them with crops and plants that they could cultivate and live on.</span>
Answer: The novel portrays the harsh conditions and exploited lives of immigrants in the United States in Chicago and similar industrialized cities. Sinclair's primary purpose in describing the meat industry and its working conditions was to advance socialism in the United States.
Explanation: