Could anyone help me understand the following question? Please solve this question with an explanation.

The picture of Teotihuacán that emerges is a classic picture of positive feedback among obsidian mining and working, trade, population growth, irrigation, and religious tourism. The thriving obsidian operation, for example, would necessitate more miners, additional manufacturers of obsidian tools, and additional traders to carry the goods to new markets. All this led to increased wealth, which in turn would attract more immigrants to Teotihuacán. The growing power of the elite, who controlled the economy, would give them the means to physically coerce people to move to Teotihuacán and serve as additions to the labor force. More irrigation works would have to be built to feed the growing population, and this resulted in more power and wealth for the elite.


In paragraph 6, the author discusses “The thriving obsidian operation” in order to
A ) explain why manufacturing was the main industry of Teotihuacán
B ) give an example of an industry that took very little time to develop in Teotihuacán
C ) Illustrate how several factors influenced each other to make Teotihuacán a powerful and wealthy city
D ) explain how a successful industry can be a source of wealth and a source of conflict at the same time