Difficulty: Easy
Correct Answer: are losing their heads
Explanation:
Concept
Tranquillity is hardest to maintain amid panic and disorder. The idiom "lose one's head" means to panic or become irrational.
Option analysis
are losing their heads — captures chaos and panic, making tranquillity difficult. ✅Other options describe agreeable or pleasant behaviour, which would not challenge one's calm.
Final Answer
are losing their heads.
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