Correct Answer: Praise

Solution : The correct option is the third option.

Explanation:
Vituperate means to criticise or berate harshly, so its opposite would be to praise or commend someone, offering warm approval or admiration instead of harsh criticism.
The meanings of the other options are as follows:

• Blame : Assign responsibility for a fault or wrongdoing.
• Abuse: To use or treat in such a way as to cause harm or damage.
• Demean: to lower in dignity, honor, or standing.

Therefore, the correct answer is praise.