According to the English alphabet series and its positional value:
Alphabets
A
B
C
D
E
F
G
H
I
J
K
L
M
Positional value
1
2
3
4
5
6
7
8
9
10
11
12
13
Positional value
26
25
24
23
22
21
20
19
18
17
16
15
14
Alphabets
Z
Y
X
W
V
U
T
S
R
Q
P
O
N
The logic follows here is: C∣+3​F​I∣+3​L​O∣+3​R​U∣+3​X​ Similarly; E∣+3​H​J∣+3​M​O∣+3​R​T∣+3​W​ Hence, "HMRW" is the correct answer.