The correct answer is A.
The Reconquista was a process that lasted almost 8 centuries, by which the Christian inhabitants of the Iberian Peninsula (that comprises the current territories of Spain and Portugal) tried to conquer back their traditional territories that had been occupied by the Muslims since year 711. Muslims denominated this land as Al-Andalus. The first battle against the Muslim conquerors was celebrated in 722 but the ultimate victory did not arrive until 1492.
In 1492, Queen Isabella I of Castile and King Ferdinand II of Aragon, whose marriage united the two kingdoms and who were jointly known as the Catholic Monarchs, managed to conquer the city of Granada, the last muslim reign ruled by Boabdil.