Select the letter that can replace the question mark (?) in the following series.
D, V, F, T, H, R, J ?

Correct option is D

The series is: D, V, F, T, H, R, J, ?
Now, let's split it into two alternating sub-series:
First sub-series: D, F, H, J (letters at odd positions)
Second sub-series: V, T, R, ? (letters at even positions)
First sub-series: D, F, H, J
D (4), F (6), H (8), J (10) This is an increasing sequence, adding +2 each time.
Second sub-series: V, T, R, ?
V (22), T (20), R (18) This is a decreasing sequence, subtracting -2 each time.
Following this logic:
The next letter in the second series after R (18) would be P (16).
Thus, the letter that replaces the question mark (?) is P. Thus, the missing letter is P.
Correct answer is (d) P.