How Is the Stimulus by Light Terminated So That the Initial

Multiple Choice

How is the stimulus by light terminated so that the initial state is restored?

A) Activated rhodopsin is blocked from activating transducin when metarhodopsin II (R*) is phosphorylated and the inhibitor arrestin binds the R*.
B) The level of cGMP is raised to reopen the gated ion channels.
C) The GTP bound to the G protein is hydrolyzed, allowing the transducin and the phosphodiesterase to return to their original states.
D) All of the above.
E) None of the answers is correct.