The following sentence contains a word with a spelling error. Rectify the sentence by selecting the correct spelling of the identified word from the given options.
I was upstaires when somebody rang the doorbell.

Correct option is D

Option (d) upstairs is the correct spelling.
Correct spelling is: Upstairs: Refers to the upper floor or level of a building. (Hindi: ऊपर की मंज़िल)
Example: She went upstairs to grab her books.