Choose the odd one:
Checking option one by one.
Option A: The balloon goes up means the situation becomes serious, critical, chaotic, or troublesome. Spot fixing scandal are serious, critical, chaotic, or troublesome.
Option B: In the altogether means without any clothes on; naked. Bath tub is used when someone is naked.
Option C: The halcyon days means a tranquil period of happiness, especially in past. Childhood is a period of time when everyone was usually happier than present.
Option D: The real McCoy means Something is genuine, authentic, or exactly what it is claimed to be; real thing. Darjeeling Tea is a sign of authenticity.
Option E: Throw down the gauntlet means To issue a challenge or invitation, as to a fight, argument, or competition. Here the authors talks about UN peace keeping force which is not related to throw down the gauntlet.
Hence, option E is the correct answer.
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