Answer:
D: The Mount Builders had slaves
Explanation:
Mount Builders were prehistoric American Indians, named for their practice of burying their dead in large mounts. They built extensive earthworks over a long period of time dating from 3500 BCE to the 16th century CE.
The best-known flat-topped pyramidal structure is located in the Cahokia Mounds State historic Site. Cahokia was an urban settlement with nearly 30,000 people. <em>A is not a true statement.</em>
Many archaeological cultures used platform mounds for their religious practices and beliefs such as public temple platforms or mortuary platforms. <em>B is not true.
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The mounds of North America were built over a long period of time by very different types of societies, ranging from mobile hunter-gatherers to sedentary farmers. <em>Statement C is false.
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These cultures evolved into complex hierarchical societies which took slaves and practiced human sacrifice. <em>D is the correct answer. </em>