Explanations:The term "historic" is used to describe events that are significant in history, often due to their extreme nature or unprecedented impact. In the context of weather events, it is used to denote occurrences that are rare and have a lasting impact on the region. The floods in December 2015 and Cyclone Vardah in Chennai are described as historic because they were unprecedented in their severity and impact on the region.
Understanding the context and appropriate use of adjectives is crucial in this question. The floods and cyclone are not just dangerous or catastrophic; they are also significant in the historical context of Chennai. The term "historic" captures this significance, indicating that these events will be remembered and studied in the future due to their unprecedented nature.
It is important to note the difference between "historic" and "historical." While "historic" refers to something that is significant in history, "historical" refers to something that happened in the past. In this context, "historic" is the correct choice because it emphasizes the significance and impact of the event, rather than just its occurrence in the past.
The other options, such as "carnage," "dangerous," and "economical," do not capture the historical significance of the event. "Carnage" implies a violent destruction or slaughter, which is not the appropriate term to describe a natural disaster. "Dangerous" is too general and does not reflect the historical significance. "Economical" focuses on a different aspect that is not relevant to the context of the event's historical impact.
Therefore, "historic" is the most appropriate term to describe the floods and cyclone in Chennai's history, as it captures both the severity and the lasting impact of these events.