help stuck on easy tbr cbt quesion

[uprine100]

ahhh how is the answer not a?
tbr cbt 1 question 116

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[msamp]

What answer was given? B?

 

[uprine100]

yes but the explanation makes no sense

 

[msamp]

You have to look at the chiral carbon and the arrangement of C,O,R,N, and H in that order. If they are arranged clockwise then its D if counterclockwise then L.