Select the option that expresses the opposite meaning of the underlined word.
The explosive used is of my own formulation, and I can vouch for its efficiency.
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. invalidate.
Given word: Vouch
Meaning: To assert or confirm the truth of something.
Example: I can vouch for his honesty.
Antonym: Invalidate
Meaning: To make something not valid; to nullify.
Example: The court invalidated the contract due to fraud.
Meaning of the other words:
Maintain: To keep in existence or preserve.
Certify: To confirm or attest officially.
Witness: To see an event happen.
Hence, the chosen option is the correct Antonym.