"Ini adalah sebuah hadiah untuk kelakuan yang bagus."
Terjemahan:This is a prize for good behavior.
Behaviour is about how you act, what you do. Attitude is about how you feel and respond to this. You can behave well but have a bad attitude. Good manner is not a thing. Good manners is being polite and respectful. In this sentence, good behaviour or good deeds is better.