Based on the chart and what you know of the Columbian Exchange, the statement that best explains why people in West Africa eat manioc is:
Europeans introduced manioc to Africa after encountering it in America.
This reflects the historical context of the Columbian Exchange, where European explorers and colonizers brought various food items from the Americas to other parts of the world, including Africa.
Regarding the second question, the most significant difference between the northern and southern Carolina settlements is:
the Northern settlement was free of slavery while the Southern settlement relied on enslaved workers.
This reflects the differing economic systems and social structures that developed in the northern and southern regions of the Carolinas, with the South relying more heavily on plantation agriculture and slave labor.