The following sentence has been divided into parts. One of them may contain an error.
Select the part that contains the error from the given options. If you don’t find any
error, mark ‘No error’ as your answer.
They want to live in first floor of this building.

Correct option is D

Option (d) contains the error.
Error identification: The phrase "in first floor" is incorrect.
Grammatical Rule used: The correct preposition for referring to a specific floor in a building is "on," not "in."
Corrected sentence: "They want to live on the first floor of this building."
Explanation: The preposition "on" is used to indicate location on a surface, such as a floor.