BMAT 2014 Q11 - rods

I thought 11 cis-retinal would absorb proton and then transform to all-trans-retinal, making activating scotopsin possible. Can someone explain why F is the correct answer?

This is an electrostatic charging question of insulating material. Where did cis retinal come from ?

Oh they aren’t rods in the eyes … Got it. Thanks!

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