ANSWER:
Crusades, military expeditions, beginning in the late 11th century, that were organized by western European Christians in response to centuries of Muslim wars of expansion. Their objectives were to check the spread of Islam, to retake control of the Holy Land in the eastern Mediterranean, to conquer pagan areas, and to recapture formerly Christian territories;
"Please keep my books in the alphabetical sequence."
"The TV show just doesn't have a logical sequence."
"Please follow the work out sequence on the sheet I gave you"
Well the answer is ... D). death from European diseases