Which of the following contributed to the spread of Islam?

A. Islam split into two groups-Sunni and Shia.

B. The Arabian Peninsula made for poor farming.

C. The bedouin became skilled horse riders.

D. The leadership of the Abbasid caliphs.
The

Which of the following explains why scarcity is a basic fact of life a. demand will always be greater than supply b. technology has not advanced far enough yet c. there will always be too many people on earth d. people cannot make good allocation decisions