Summarize French expeditions in the New World

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).

no every country is held to the same degree as others just some member countries such as the usa and germany are more economically sound so the need to show there support to all others  

i believe the answer is the last option, the magyars preferred to invade by land.

i hope this ! : )

the correct answer would in fact be b. (: