The Arabs' Failure to Take Constantinople in the Late Seventh

The Arabs' failure to take Constantinople in the late seventh and early eighth centuries was extremely important for later history because it

A) signaled the onset of Muslim decline.
B) provoked Latin Crusaders to attempt the reconquest of the Holy Land.
C) meant that Islam would not advance into the Balkans for another 700 years.
D) inspired Virgil to write the Aeneid.
E) meant Islam will never be accepted by westerners.