Which of the following was a result of the crusades?

A permanent conquests of the Holy Land by Christians
B religious tolerance in Western Europe
C increased trade in Western Europe
D the reunification of the Roman and Byzantine churches

The answer is A.
These then became :-

The Knights of Jerusalem.
The Knights of Rhodes. And
The Knights of Malta.

Their origin was that they were Hospitaliers.
They used to tend to the wounded Christians that visited the Holy Land.

Roland.