When an inducer is added to a medium containing an organism with a metabolic pathway controlled by a repressor, the inducer then

A) combines with the repressor and activates the repressor.
B) combines with the repressor and inactivates the repressor.
C) combines with the substrate and blocks induction.
D) combines with the substrate and activates induction.
E) does not combine with, but functions as a chaperone molecule for, the enzyme-substrate complex.