Which of the following statements regarding enzyme regulation is correct?

A)Addition of an inhibitor to a V system results in kinetics similar to addition of a competitive inhibitor to a typical hyperbolic system.
B)Allosteric effectors are always more powerful than covalent modification.
C)Addition of an allosteric activator to a K system changes the plot of V versus [S] from a sigmoidal curve to a more hyperbolic curve.
D)The T state of an enzyme generally has more activity than the R state.