The correct answer is
C: Zacuto, an astronomer, prepared the astronomical charts which guided Columbus on his voyages. In 1502, Columbus and his crew were stranded off the Jamaican coast and in danger from the natives. Learning from the charts that a lunar eclipse was imminent, Columbus told the natives that if they did not cooperate with him, the moon would disappear from the sky. While they did not believe him at first, when the eclipse took place, the frightened natives relented and brought food to Columbus and his crew.