Correct Answer: OINTMENT

Solution : Given:
ENVIRONMENT

Now, let's compare all the option words with the word ENVIRONMENT –
First option: OINTMENT; All the letters of OINTMENT are not present in the word ENVIRONMENT. There are two T in the word OINTMENT but only one T is present in the word ENVIRONMENT.
Second option: MENTOR; All the letters of MENTOR are present in the word ENVIRONMENT.
Third option: VENOM; All the letters of VENOM are present in the word ENVIRONMENT.
Fourth option: TRIM; All the letters of TRIM are present in the word ENVIRONMENT.

So, from the above, only OINTMENT cannot be formed using the letters of the word ENVIRONMENT. Hence, the first option is correct.