A sentence with a grammatical error is given. Identify the error and select the sentence which is error-free and grammatically correct. Miss Marple stood through the curtain and saw all that Mary was doing in the bedroom.4124

1. Miss Marple stood on the curtain and saw all that Mary was doing in the bedroom.
2. Miss Marple stood above the curtain and saw all that Mary was doing in the bedroom.
3. Miss Marple stood behind the curtain and saw all that Mary was doing in the bedroom.
4. Miss Marple stood for the curtain and saw all that Mary was doing in the bedroom.