If the G Proteins in Photoreceptors Are Pharmacologically Blocked, Exposure

If the G proteins in photoreceptors are pharmacologically blocked, exposure of these photoreceptors to light will

A) raise the intracellular concentration of cations.
B) lower the intracellular concentration of cations.
C) cause electroreceptors to open ion channels.
D) cause a signaling cascade.
E) have no effect on these receptors.