The teacher complained ______________ his rude behaviour.
- By
- About
- on
- for
Explanation
We word complain is followed by to/about.
To & about are prepositions here.
Complain to someone کسی انسان سے شکایت کرنا
Complain about something کسی معاملے پر شکایت کرنا
The teacher complained about his rude behaviour.