The correct answer is "dis". The word "dis" is a prefix that means "not" or "opposite of". In the context of the sentence, "disagreement" refers to a lack of agreement or a difference in opinion or belief (അഭിപ്രായവ്യത്യാസം).
There was some disagreement over the topic. (വിഷയത്തിൽ ചില അഭിപ്രായവ്യത്യാസങ്ങളുണ്ടായി).