Which of the Following Statements Concerning Negative Feedback Is NOT

Which of the following statements concerning negative feedback is NOT correct?

A) Negative feedback exists when a change in a regulated variable triggers a response that opposes the change.
B) Negative feedback exists when the input to a system increases the output, and the output limits its own production by inhibiting the input.
C) With negative feedback, a control system's input and output continue to enhance each other.
D) Most of the body's homeostatic control mechanisms operate on the principle of negative feedback.