Correct Answer: compliment

Solution : The second option is correct.

Explanation:
Denounce means to publicly declare to be wrong or evil.
A compliment is a polite expression of praise or admiration.
Hence, from the given meanings, we find that denounce and compliment are antonyms.

The meanings of the other options are as follows:

• Threaten : state one's intention to take hostile action against someone in retribution for something done or not done
• Create : bring something into existence
• Accuse: charge someone with an offence or crime

Therefore, the correct answer is compliment.