Which u. s. senator represented the south and argued that slavery was necessary?

John C. Calhoun was the US South Senator who believed that slavery was necessary. He was a political theorist that believed in republicanism, which also included the approval of slavery. He defended slavery as a “positive good” and as a result Southern minority threats escalated. 

the answer is b. hope this !

most people now work in jobs where they do one  kind  of work; they are carpenters, bankers, cooks, mechanics, and so forth. likewise, most  businesses produce  only certainkinds  of  goods  or  services, such as cars, tacos, or gardening  services. this feature of  production  is known as specialization.