The definition which closely matches the context in which the word is used in the sentence is definition one which states that a plague is a disastrous evil or affliction, calamity. That is a.
Why it is not the other versions
The other versions of the definition are more closely linked to a disease. A Tsunami is a weather anomaly such as a high sea wave that may be caused by very strong tremors in the earth's crust or other climatic conditions.
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