The correct option is B First
The Siege of Jerusalem took place from June 7 to July 15, 1099, during the First Crusade. The climax of the First Crusade, the successful siege saw the Crusaders take Jerusalem from the Fatimid Caliphate and laid the foundations for the Kingdom of Jerusalem. Hence, Option A is correct. The main goal of the second crusade was to recapture Edessa from Muslim control. 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. The stated intent of the fourth crusade was to recapture the Muslim-controlled city of Jerusalem, by first conquering the powerful Egyptian Ayyubid Sultanate, the strongest Muslim state of the time. Hence, these are incorrect.