What Was the Primary Cultural Contribution of the Muslims During

What was the primary cultural contribution of the Muslims during the Abbasid period?

A) The Muslims were able to recover and preserve the works of the ancient philosophers as well as transmit from one civilization to another.
B) The Muslims became extraordinarily adept at portraiture, focusing on depictions of Muhammad and the early Caliphs.
C) Although the material culture of the Abbasid period remained poor, Muslims were able to make some advances in music.
D) Islamic learning was necessarily unique, as they had no access to the ancient traditions of philosophy and science.