Greeks and romans called all foreigners "barbarians" because

select one:

a. they were not christian.
b. they did not live in cities.
c. they did not reside in the greek or roman empires.
d. of their unintelligible languages and strange customs.
e. of their pagan religious beliefs.

the answer would be:

b. race

i actually have a suggestion instead of an answer, how about next time instead of spending the time to time up the question you take that time and try to figure something out for yourself, do you understand?

explanation:

leave a 5 star and a and brainliest answer if you understand, hope this betters you day, or not i don't really care either way. xd