Everything that he did was open and :Aabove allBabove onCabove boardDabove inAnswer: C. above board Read Explanation: Above board → means honest, legal, and open (without any secrecy or deception). This pairs perfectly with "open" in the sentence.Above all → means most importantly (e.g., Above all, be kind). Does not fit here.Above on → not a standard English phrase.Above in → not a standard English phrase. Read more in App