The students were pulled down by the principal for their misbehaviour with the class teacher.
- were pulled off by
- are pulled by
- were pulled with
- were pulled up by
- No correction required
Explanation: pull up is a phrasal verb, which mean stop or scold. Here this is the correct form. Also pull off means succeed and pull with means live together.
Another example: The son was pulled up by his mother for disturbing her.