Question

Why were the Crusaders so successful in the first Crusade?

Answer 1

The reason why the Crusaders were so successful in the first Crusade was that the Turks were already weak from fighting themselves - B.

Contrary to common thought, at the times there was no single unified muslim resistance that was fighting the Crausaders, at least in the beginning. There were a lot of fractions that were fighting between themselves and against the Crusaders.