The correct option is D Reconquista
Reconquista, English Reconquest, in medieval Spain and Portugal, a series of campaigns by Christian states to recapture territory from the Muslims (Moors), who had occupied most of the Iberian Peninsula in the early 8th century. Hence, Option A is correct. The Fourth Crusade was a Latin Christian armed expedition called by Pope Innocent III. The stated intent of the expedition was to recapture the Muslim-controlled city of Jerusalem, by first conquering the powerful Egyptian Ayyubid Sultanate, the strongest Muslim state of the time. The Children's Crusade was a failed popular crusade by European Christians to regain the Holy Land from the Muslims, said to have taken place in 1212. The Third Crusade was an attempt by the leaders of the three most powerful states of Western Christianity to reconquer the Holy Land following the capture of Jerusalem by the Ayyubid sultan Saladin in 1187. Hence, these options are incorrect.