If a Biochemist Discovered an Enzyme Inhibitor for the Enzyme

If a biochemist discovered an enzyme inhibitor for the enzyme photodiesterase (PDE) how would vision be affected if this enzyme inhibitor was applied to a vertebrate eye?

A) The opsins found in cones would not be differentiated into the red,blue,and green proteins,causing the animals to be color blind.
B) The cGMP-gated sodium channels would remain open,glutamate would be continuously discharged at the synapses,and the brain would not detect light absorbed by the rod cells.
C) The lens could not be appropriately adjusted to focus light on the retina,resulting in either nearsightedness or farsightedness.
D) All of the above answers are correct.