Select the letter that can replace the question mark (?) in the following series.
A, D, B, F, D, I, G, ?, K.
Given series is an alternate series with the two series are A, B, D, G, K, ... and D, F, I, ...
In A, B, D, G, K, ...
A + 1 = B
B + 2 = D
D + 3 = G
G + 4 = K
In D, F, I, ...
D + 2 = F
F + 3 = I
The next letter of the given series is the next letter of the series D, F, I, ...
$$\therefore\ $$The next letter of the series = I + 4 = M
Hence, the correct answer is Option B
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