What historic events have occurred in the 20th century that have helped shape public opinion and which political parties have they benefited? plz, I need help.

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).

answer: the unlawful use of violence and intimidation, especially against civilians, in the pursuit of political aims.

explanation:

according to my calculation, the answer is d.