People were jealous of the highly skilled immigrants arriving from europe

Yes, people were jealous of the highly skilled immigrants arriving from Europe because they were good at certain things that some people cannot do. It is part of the human nature to be jealous of something that we can’t do, that is why people tend to practice their skills on different kind of tasks.

the conditions that made the byzantine empire vulnerable to attacks by the muslin turks were the sack of constantinople by western crusaders, the conquests of the sultanate of rum, presence of rival kingdoms and finally the set up of fiefdoms at the empire which were owned by the ghazis (turkish warriors).

your answer will most likely be a.