CR Question.

Hey guys..
I need some help on the attached question.
First of all there's nothing about animals in the stimulus.As a result I automatically eliminate A,B and D.We're only left with C and E.However E can be eliminated too as there is nothing that makes Rhodopsin the only pigment.

Thats done.

Secondly even if we consider animals to be part of the stimulus(We're not supposed to,but I agree to disagree).
Option A. Temperature <-->Molecular motion , Now is Amount of light <--->Molecular motion?? We're not told,hence I eliminate A

I'm left with B,C,D, &E

I can eliminate C & E,citing lack of information in the Stimulus.

So I now have B,D.How do I eliminate one among these two choices?First of all I think I've done a great job by eliminating A,C & E.To be honest all answers looked unlikely,however can anyone please clarify this problem?It looks unsolvable.

Also,please tell me more about MOST,SOME,MANY in CR questions,which one's are more stricter when it comes to choosing them as answers(I mean which one needs more tests to be conducted by rechecking their quantities in the Stimulus)?

Thank you

Dan