The correct answer to this open question is the following.
Although there are no options attached, we can say the following.
Damascus, Baghdad, and Cordoba were important Muslim cities during the Middle Ages. Which of these contributed most to its growth?
Answer: historians consider that Cordoba contributed in many ways to the development of the Muslim Golden Age.
Cordoba was already a modern city in the Middle Ages because the Romans had constructed the kind of infrastructure to make Cordoba one of the most modern cities of its time in medieval times. So when Muslims captured Cordoba, they found that Cordoba with good roads, aqueducts, brides that facilitated heavy transportation, and trade markets where merchants sold their crops such as grapes, grains, and olives.
