Use the rules one by one to eliminate answers.
C is out, because L can’t go in S. Ok, this wasn’t a rule, this was a deduction from our diagram.
If J is in S, then K is in R. So A is wrong.
B doesn’t violate any rules. B is CORRECT.
D is wrong because Pr leads to Ks. (You need to consider which variables go in R)
E is wrong because Jr leads to Os.
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