The fun ction o f M LC K in s m ooth m usc le cells is to

A) Ph os ph or ylate ac tin
B) Ph os ph oryla te th e reg ulat ory lig ht c ha in o f m yos in
C) D ep ho sp ho ryla te tr op om yos in
D) Ph os ph or ylate tro po m yos in
E) Regulate the Ca₂+ sensitivity of TnC