The development of feudalism occurred in response to which event?

The development of feudalism occurred in response to the fall of the Roman Empire in the 5th century, the rise of Christianity in Europe and the rise of the Barbarian Kingdoms. The Roman Empire was discharged by the Visigoths that led to the arrival of the feudalism in the society. 

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.