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Answers and rating deltas for

Can someone explain why the answer is B? I'm using Java and I don't understand

Author Votes Δ
Eran 6 +1.11
Charlie Martin 3 +1.14
Nayuki 1 -0.09
rfinster 0 -1.82
Konstantin Yovkov 0 -1.92
Last visited: Nov 17, 2015, 9:47:00 AM