Find the missing term. B, D, F, ?, J

In a letter series, each letter can be replaced by its position in the alphabet (A = 1, B = 2, ... Z = 26). When consecutive terms of the series increase by a fixed number of positions, that fixed increase is the pattern connecting every term, including any missing one.

Applying it to this series:

1. Convert each given letter to its alphabet position: B → 2, D → 4, F → 6, J → 10.

2. Find the position increase between consecutive terms: D − B = 4 − 2 = 2, and F − D = 6 − 4 = 2, so each term is 2 positions after the one before it.

3. Apply the same +2 increase to the last given term before the gap: F(6) + 2 = 8, so the missing term's position is 8.

4. Convert position 8 back to a letter: the 8th letter of the alphabet is H.

Checking forward confirms this: the missing term's position (8) plus 2 gives 10, which matches the position of J, the term right after the gap, so the same +2 gap holds on both sides of the missing term.