Correct Answer: ROUTE

Solution : Given:
INTROSPECTION

Now, let's compare all the option words with the word INTROSPECTION –
First option: INSPECTION; All the letters of the word INSPECTION are present in the word INTROSPECTION.
Second option: SCOPE; All the letters of the word SCOPE are present in the word INTROSPECTION.
Third option: SECTOR; All the letters of the word SECTOR are present in the word INTROSPECTION.
Fourth option: ROUTE; All the letters of the word ROUTE are not present in the word INTROSPECTION. U is not present in the word INTROSPECTION.

Therefore, ROUTE cannot be formed from the word INTROSPECTION. Hence, the fourth option is correct.