Identify the error in the following sentence.
Once on a time, there was a brave king.

Correct option is B

Option (b) contains an error.
Error Explanation:
· The correct phrase is “Once upon a time”, not "Once on a time."
· "Upon" is the correct preposition used in traditional storytelling.
Grammatical rule used:
· The phrase "Once upon a time" is a standard introductory phrase used in storytelling.
· The preposition "upon" indicates a general or indefinite time in the past.
Example:
· Incorrect: Once on a time, there was a beautiful princess.
· Correct: Once upon a time, there was a beautiful princess.