The best explanation of the effects of the Yamasee War on the restructuring of settlements and the shift in power in South Carolina is: Indigenous power declined, while colonial power increased.
The Yamasee War, which took place in the early 1700s, resulted in significant losses for various Indigenous groups in the region, leading to a decline in their power. Conversely, the British colonists emerged more dominant, which facilitated the expansion and restructuring of their settlements.