The best definition of a "citizen" is a person who
gives allegiance to a government
pays money to gain rights
moves to a new country
works many years for a nation

hi!

your answer is d

mark me brainliest

~courtney

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).