Answer:
The correct answer is C) Roman culture, Germanic tribes, Christian traditions
Explanation:
C is correct answer because Middle Ages started after the Fall of the Western Roman Empire in 476 AD. The Empire was crushed by the Germanic tribes, that later actually accepted Christianity as their official faith.
A is not correct because this reflects more on the Arabic world, which accepted Islam in the 7th Century on the soil of Africa and Near and Middle East.
B is not correct because Europeans among the other things didn't known anything about American culture before 15th Century.