Correct option is D
Given:
In a certain code language, ‘lab bird set’ is coded as 'ef xo ej'.
‘set web hall’ is coded as ‘ot ef hs’.
From the given information, the arrangement will be.
Comparing the two coded sentences:
Common word in both sentences: 'set'
Common code in both code groups: 'ef'
Therefore, the code for 'set' is 'ef'.
Thus, the correct option is (D).