Which of the following words is closest in meaning to “Catastrophe”?

Catastrophe means a calamity; a sudden great disaster.

• Correct answer - calamity: it has the same meaning as Catastrophe.
• expedition: a journey made for a purpose - wrong, it does not mean the same as Catastrophe.
• courtly: refined and polite like a royal court - wrong, it does not mean the same as Catastrophe.
• troublemaker: one who causes trouble - wrong, it does not mean the same as Catastrophe.