According to the given information, each vowel word is replaced by a second latter following it $(+2)$ latter from the vowel.
in the same way, each consonant word is replaced by a third latter following it $(+3)$ latter from the consonant.
Vowel word:
- $O\xrightarrow{+2}Q$
- $I\xrightarrow{+2}K$
- $U\xrightarrow{+2}W$
- $E\xrightarrow{+2}G$
Consonant word:
- $B\xrightarrow{+3}E$
- $L\xrightarrow{+3}O$
- $Q\xrightarrow{+3}T$
So Correct change of the word “OBLIQUE” is “QEOKTWG
Option (C) is correct.