Correct option is B

Logic:
The first position follows the pattern of increasing by 5.
The second position follows the pattern of increasing by 5.
The third position follows the pattern of increasing by 5.
Explanation:
First position:
A to F: +5
F to K: +5
K to P: +5
P to U: +5
Second position:
C to H: +5
H to M: +5
M to R: +5
R to W: +5
Third position:
W to B: +5
B to G: +5
G to L: +5
L to Q: +5
Thus, the missing term in the series will be: UWQ.