Hey, it's b because slavery was the main thing that supported the South's economy - hope this helps :)
"In 768 Charlemagne became king of the Franks. He fought to increase his power and territory and greatly expanded his empire. As a result, much of the original Roman empire fell under his rule. He was responsible for the creation of schools and the spread of Christianity throughout Europe.
Austronesian migrations differed from other early patterns of human movement as Austronesian migrations occurred more recently that early patterns of human movement. The Austronesian also used water transportation, and during their migration, they brought tame animals and naturalized plants in their vessels (canoes) as they had a background in agriculture and agricultural technology.
Basalt, Granite, Pegmatite, Limestone, sandstone, Shale and Sandstone, Slate
Cant be A Cant be B so it has to be (C.)
