Correct Answer - Option 3 : UHVNGS
Given,
NUMBER → PXQGKY
The code of a word is formed by replacing the first letter with its second successor, the second letter with its third successor, the third letter by its fourth successor, and so on.
S + (2) → U
E + (3) → H
R + (4) → V
I + (5) → N
A + (6) → G
L + (7) → S
Hence, UHVMGS is the code for the word SERIAL.