Where did the concept of feedback come from？
A.It was invented by Confucius.
B.It was invented by Aristotle.
C.It was invented in World War 2 while working on anti aircraft guns.
D.It was invented to catch fish.
E.It was invented very recently in Alibaba'；s research centre.
正确答案：It was invented in World War 2 while working on anti aircraft guns.