Final answer:
A catastrophe is the most suitable word to complete the sentence as it refers to a sudden, widespread disaster or event that results in great damage or suffering.
Step-by-step explanation:
The most suitable word to complete the sentence is catastrophe.
A catastrophe refers to a sudden, widespread disaster or event that results in great damage or suffering. It often disrupts normal life and makes it difficult to restore normalcy. Examples of catastrophes include natural disasters like hurricanes, earthquakes, or tsunamis, as well as man-made disasters like terrorist attacks or major accidents.