Which of the Following Best Summarizes the Effect of the Crusades

Which of the following best summarizes the effect of the Crusades on Southwest Asia?

A) The Crusades were economically devastating to the important centers of trade such as Jerusalem.
B) Muslim leaders did not see knights as a threat and the Crusades were irrelevant.
C) The establishment of the Crusader states threatened to undermine the religious dominance of Islam.
D) The Crusades struck a permanent blow to the prestige and power of cities like Baghdad and Cairo.