How did Muslims create such an advanced society in Spain

Islam was a widespread religion in the Iberian Peninsula, beginning with the Umayyad conquest of Hispania and ending (at least overtly) with its prohibition by the modern Spanish state in the mid-16th century and the expulsion of the Moriscos in the early 17th century, an ethnic and religious minority of around 500,000 ...

C. congress was able to pay debts run up in the war

Ithink the answer is a.