R S configuration

[jgdg]

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On topscore, test 1 number 94, why is the answer A? I got that answer C was R configuration and B and A were S configuration

 

[Kingsta2426]

On topscore, test 1 number 94, why is the answer A? I got that answer C was R configuration and B and A were S configuration

I think they meant to represent them as Fischer projections where the lowest priority groups have to be on the vertical positions, or at least that is how I got the answer they had for the key.

 

[lr2014]

This is what I found online:
Use the periodic table to assign priority to the groups around the central carbon. The configuration of A is R. B and C are both S. The answer is therefore A.

 

[jgdg]

Thank you so much!!!