The best description of the function of phosphatases in signal transduction is that it

A)moves the phosphate group of the transduction pathway to the next molecule of a series.
B)prevents a protein kinase from being reused when there is another extracellular signal.
C)amplifies the transduction signal so it affects multiple transducers.
D)amplifies the second messengers such as cAMP.
E)inactivates protein kinases and turns off the signal transduction.