What did the king of queen of spain give columbus and return

For a decade, Columbus approached the Portuguese king and the Spanish monarchs to obtain a grant to explore possible trade routes to the west. After initially turning him down, King Ferdinand and Queen Isabella reconsidered once the Moors had been successfully expelled from Spain in 1492. I don't know if this is what you are looking for but I hope it helps.

i used to know but i learned it a long time ago sorry

explanation:

i think the answer is a and i hope this ; ))