The person who ordered Naboth's killing was Jezebel, the wife of King Ahab. Naboth was a vineyard owner who refused to sell his vineyard to Ahab, as it was considered an inheritance from his ancestors. Jezebel devised a plan to have Naboth falsely accused of blasphemy, which led to his stoning to death by the people of his town. Jezebel then told Ahab that he could take possession of Naboth's vineyard. This incident is recorded in the Old Testament of the Bible, in 1 Kings 21.
Therefore, "Jezebel," is the correct answer.