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Explanation:

“Calamitous” means 'Causing or involving calamity'.
“Catastrophic” means 'involving or causing sudden great damage or suffering'.
“Cataclysmic” means 'causing sudden and violent upheaval'.
Rest of the words are invalid since they have unrelated meanings. So, eliminate options 1, 2, 3 and 5.
Hence, the correct answer is option 4.

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