C
Below is a question with multiple-choice answers. Choose the correct option based on your reasoning.

### Question:
In a series of chemical reactions, X→Y→Z→A, X converts to Y, Y converts to Z, and Z converts to A. Which term describes the process if the production of A interferes with the conversion of X to Y?

### Choices:
A. a complimentary response
B. a control system
C. negative feedback
D. positive feedback

### Answer:
