The correct answer is annihilate.To destroy completely means annihilate.Annihilate means destroy, defeat, obliterate.Example: Bravo leaving me would annihilate me. From the above meaning, it is evident that annihilate is the same meaning as the word to destroy completely.Additional InformationKill means cause the death of, murder.Tear apart means to violently rip or pull someone or something into pieces. Example: ?Lots of words in a sentence are torn apart in a sentence.?Hence, option 2) annihilate is the correct meaning of 'to destroy completely'.