The best option and answer is the second one, it says “Mother asked Freddie, who was being disruptive and unruly, to sit down and listen up”.
For a misplaced modifier case to happen, the word, clause, or even a phrase that describes is apart from the word that it is describing or modifying. And as a result of that separation, sentences tend to sound confusing, weird or illogical. So, in your question, the rest of the options aren’t correct because if someone reads it, it seems that the person who was being disruptive and unruly is the mother when in fact it was Freddie.