For what purpose do archaeologists think mound A was built? Why do they think that?

Archaeologists identify Poverty Point culture by its characteristic artifacts and the nonlocal rocks used to make them. Imported rocks and minerals include various cherts and flints, soapstone, hematite, magnetite, slate, galena, copper, and many others. Radiocarbon dates indicate that some raw materials were being traded to the Poverty Point site and other sections of the Poverty Point culture area by 1730 B.C. The arrival of substantial amounts of these trade materials is a convenient point to define the onset of Poverty Point culture, and their disappearance, a good point to mark its end.

Explanation:

the answer is a) to be able to obey them.

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