The following sentence has been divided into parts. One of them may contain an error.
(1) Ravi walked / (2) up to a Principal’s cabin / (3) but could not meet him. / (4) No Error

Correct option is B

Option (b) contains an error.
The error is in the phrase "up to a Principal’s cabin." The article "a" is incorrect here because "Principal" is a specific title, and the correct article should be "the." The correct phrase should be "up to the Principal’s cabin."
Grammatical rule used:
· Articles with titles: When referring to a specific person holding a title or position, such as "Principal," the definite article "the" should be used instead of the indefinite article "a."
Example:
· Incorrect: He went to a President's office.
· Correct: He went to the President's office.