The right answer is (4): held <span>positions of power in feudal systems.
Some examples why the other answers ar</span>e wrong inlude: Samurai are from Japan and they did not fight in Spain (not 3) and they were military fighters, not religious leaders (not 1)
The Roman empire was well organized with good roads & active trade, so the new religion could spread easily. Constantine was a sun worshipper who feigned Christianity so he could take control and throw out it's one and only goal