Correct Answer: Frenzy

Solution : The second option is correct.

• Calm means peaceful, quiet, and relaxed.
• The marked option frenzy means a state of wild excitement or confusion.

Therefore, the most appropriate antonym of calm is frenzy.

Additional Information

• Harmonious means having a pleasant and peaceful atmosphere.
• Placid means calm and peaceful.
• Low-key means not attracting attention or being modest.