Correct Answer: LIBERAL

Solution : Given:
LIBERATION

Now, let's compare all the option words with the word LIBERATION –
First option: RATIO; All the letters of RATIO are present in the word LIBERATION.
Second option: AION; All the letters of AION are present in the word LIBERATION.
Third option: BEAR; All the letters of BEAR are present in the word LIBERATION.
Fourth option: LIBERAL; L is only present once in the word LIBERATION, but is present twice in the word LIBERAL. Therefore, all the letters of LIBERAL are not present in the word LIBERATION.

So, LIBERAL cannot be formed with the letters of the word LIBERATION. Hence, the fourth option is correct.