most likely describes Shi Huangdi’s reason for ordering the construction of the Great Wall and the Terracotta Warriors?

According to Records of the Grand Historian, Qin Shi Huang ordered construction of his mausoleum to begin when he took the throne of the Qin State in 246 BC. The role of the Terracotta Army was to "guard" the entire mausoleum and Qin Shi Huang believed that the army could protect him in the afterlife.

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C. develop complex societies.

Explanation:

With the development of agriculture and the domestication of animals it allowed nomad tribes to settle in one area as before they followed herds of animals to hunt.