Step 1: Understanding spelling correction.
The task is to select the word with the correct spelling.
Step 2: Analyzing each option.
- (A) Desastir: Incorrect due to misplaced "a" and "s".
- (B) Deastar: Incorrect, with "e" misplaced and "a" repeated.
- (C) Disaster: This is the correct spelling, referring to an event causing great damage.
- (D) Diustar: Incorrect due to misplaced "u" and missing letters.
Step 3: Conclusion.
The correct spelling is Disaster (C).