Which of the following letter-clusters will replace the question mark (?) in the given series to make it logically complete?

QRT, SVR, UZP, WDN, ?​​

​​Series: QRT, SVR, UZP, WDN, ?

Logic: 1st + 2 , 2nd + 4 , 3rd - 2 

1st letters (Q, S, U, W, ?):

Q + 2 → S

S + 2 → U

U + 2 → W

W + 2 → Y

2nd letters (R, V, Z, D, ?):

R + 4 → V

V + 4 → Z

Z + 4 → D

D + 4 → H

3rd letters (T, R, P, N, ?):

T - 2 → R

R - 2 → P

P - 2 → N

N - 2 → L

The next cluster is YHL.

Thus, correct option is (c).