What Would Occur at Location Number 4 in the Figure

What would occur at location number 4 in the figure in the absence of light?

A) cGMP would detach itself from the sodium channels, causing them to close.
B) cGMP attached to the sodium channels would cause them to open.
C) Darkness would inactivate rhodopsin by isomerizing retinal from cis to trans.
D) Darkness would inactivate rhodopsin by isomerizing retinal from trans to cis.