Each term is a four-letter consecutive block. Starting letters B(2), F(6), J(10), N(14) increase by +4. Next start is R(18), so the block is RSTU.
Option A:
Option A starts at Q(17), which is only +3 from N, not +4.
Option B:
Option B is correct because R is +4 from N and S,T,U follow consecutively.
Option C:
Option C starts at S(19), which is +5 from N, not +4.
Option D:
Option D starts at O(15), which is +1 from N and also disrupts the forward pattern.
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