An Enzyme Has a Total of Four Active Sites

Multiple Choice

An enzyme has a total of four active sites.When you denature the molecule and study its composition,you find that each active site occurs on a different polypeptide.Which of the following hypotheses does this observation support?

A) The enzyme is subject to allosteric regulation.
B) The enzyme requires a cofactor to function normally.
C) The protein's structure is affected by temperature and pH.
D) The protein has quaternary structure.