The correct response based on the analysis of the table is:
The Spanish Reconquista united the territories and religions of Spain, which allowed Spain to spread Catholicism more easily.
This statement reflects the events described, particularly the idea that the Reconquista not only involved the clash between Christians and Muslims but also contributed to a unified Christian identity in Spain, making it easier for Spain to promote and spread Catholicism thereafter. The joining of Aragon and Castile further solidified this unity under a centralized political unit. However, the statement about colonizing Portugal is inaccurate as Portugal remained a separate entity.