all options except A follows a certain pattern
15 : 46 === $$ 15 \times 3 + 1 = 46 $$
9 : 28 === $$ 9 \times 3 + 1 = 28 $$
8 : 25 === $$ 8 \times 3 + 1 = 25 $$
but 12 : 39 is a wrong pattern
correct one is 12 : 37 === $$ 12 \times 3 + 1 = 37 $$
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