Answer:
His sailing experience throughout the Mediterranean Sea and the scientific calculations of Marcos Polo and his description of the luxury of China and Japan
Step-by-step explanation:
Prior to the acceptance of Ferdinand II and Isabella of Spain to finance the Christopher Columbus voyage to the proposed East adventure, Columbus has been working along with various sailors sailing throughout the Mediterranean sea.
He was also influenced by the scientific calculations of Marcos Polo and his description of the luxury of China and Japan. These experiences prepared him to become the “Admiral of the Ocean Seas” by the time his proposal was granted.