<em>Answer: C</em>
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Explanation: C gives us a strong reason why reclamation has gotten cheaper. The nature of the mines has changed, making it less difficult to reclaim them.
B looks good EXCEPT look very carefully at the wording of the argument.
“What led to the outbreak of the bloodiest conflict in the history of North America? A common explanation is that the Civil War was fought over the moral issue of slavery. In fact, it was the economics of slavery and political control of that system that was central to the conflict.” I hope this helps you for what your looking for
<span>The Ancient Puebloans were prehistoric Native Americans whose core civilization lies at the center of the present-day Southwest United States. The ancestors of the modern Puebloans include Hopi and Zuni. They are also called the People of Long Ago.<span>
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Not all developing countries are in Latin America; many are in Africa and Asia.
They are not called "Western" - as most western countries are developed, not developing. The correct answer is that they have less developed infrastructure, as their infrastructure is still developing.