Correct Answer: BETRAY

Solution : Given:
DELIBERATE

Now, let's compare all the option words with the word DELIBERATE –
First option: DILATE; All the letters of DILATE are present in the word DELIBERATE.
Second option: TAIL; All the letters of TAIL are present in the word DELIBERATE.
Third option: BETRAY; Y is not present in the word DELIBERATE. Therefore, all the letters of BETRAY are not present in the word DELIBERATE.
Fourth option: ELATED; All the letters of ELATED are present in the word DELIBERATE.

So, BETRAY cannot be formed with the help of the letters of the word DELIBERATE. Hence, the third option is correct.